45mm inlet and Plenum base inc 72 mm throttle pot.
Discussion
I also believe doing both exhaust and inlet increases the useable power curve
Extend it further up the revs towards limiter as often they just get really inefficient over 5200. Revs, that can make a lot of difference to overall performance and make the car a lot faster overall.
Even Mac mentioned the other week the better it all flows and just as importantly on a Turbo car it just adds lots of useable power let alone the two sets of numbers we go on about.
If you read into exhaust effects which are essentially the same as induction pulse or bounce as air gets sucked in then forced back out up towards Plenum, these forces on the exhaust side can help suck or push so allowing different can duration times, it gets complicated but the more purging you get from better flow rates the quicker you can fill or empty a cylinder so can reduce or lengthen these cam opening times to get best volumetric efficiency ( VE )
Talking about F1
The Gurney/Weslake V12 3.0 l engine of around 1968-72 that Weslake had built as a two cyl test engine with 4 valves per cyl. It was the first engine they’d ever tested on the bench that pumped out 158/160 Bhp per litre. BRM was persisting with a V16 and wouldn’t take on the design, Weslake showed Dan Gurney the test engine and it’s heads and the plans for a V12 based opon it and Gurney provided the money to build it. He won at Spa one year with this very engine. 450 Bhp from a 3.0 litre V12
Getting air In and out is always the key.
I thought it was thoughougly interesting
Extend it further up the revs towards limiter as often they just get really inefficient over 5200. Revs, that can make a lot of difference to overall performance and make the car a lot faster overall.
Even Mac mentioned the other week the better it all flows and just as importantly on a Turbo car it just adds lots of useable power let alone the two sets of numbers we go on about.
If you read into exhaust effects which are essentially the same as induction pulse or bounce as air gets sucked in then forced back out up towards Plenum, these forces on the exhaust side can help suck or push so allowing different can duration times, it gets complicated but the more purging you get from better flow rates the quicker you can fill or empty a cylinder so can reduce or lengthen these cam opening times to get best volumetric efficiency ( VE )
Talking about F1
The Gurney/Weslake V12 3.0 l engine of around 1968-72 that Weslake had built as a two cyl test engine with 4 valves per cyl. It was the first engine they’d ever tested on the bench that pumped out 158/160 Bhp per litre. BRM was persisting with a V16 and wouldn’t take on the design, Weslake showed Dan Gurney the test engine and it’s heads and the plans for a V12 based opon it and Gurney provided the money to build it. He won at Spa one year with this very engine. 450 Bhp from a 3.0 litre V12
Getting air In and out is always the key.
I thought it was thoughougly interesting
Yella Terra, took two minutes looking and reading.
Less side load on valve guides for one. Less friction another.
I’m going for shortened guides as they are a massive restriction if you just look into the ports,
So these Yella Terra look great value if they are reliable and long lasting. Can’t see any reason why not. It’s not just the Rv8 these things are made for.
There just damn fine looking things.
Better get earning some investement funds
Anyone need a gardener
Less side load on valve guides for one. Less friction another.
I’m going for shortened guides as they are a massive restriction if you just look into the ports,
So these Yella Terra look great value if they are reliable and long lasting. Can’t see any reason why not. It’s not just the Rv8 these things are made for.
There just damn fine looking things.
Better get earning some investement funds
Anyone need a gardener
spitfire4v8 said:
Ive never had any success using cartridge sanding sets .. ive always left mine as carbide finish. As long as the shape is smooth the difference in airflow is minimal. But for the extra bling factor if you want to sand them smooth then go for it.
Agreed, thrown them aside there s
t. If you can learn the art of consistent pressure and shaving uniformly I’m close to thinking you could do 90% with the carbide bits alone. Very satisfying when it’s all nice and smooth I’ll say that
Sardonicus said:
Some porn for Alun 
Got To Do Something With My Time Waiting For Parts 
These look loads easier to set up once you’ve done the intitial set up work fitting them to the heads. Got To Do Something With My Time Waiting For Parts Are these your heads Simon. The sound of your car coming past was confirmation more than words can say, glorious.
All that air induction and thunder, I could almost feel those big valves opening
It’s going to look great too. Polished cyl heads anyone,,, not just the inside either
If it looks good it surely must go good
phazed said:
Alun. you could have borrowed my old exhaust manifolds for matching up.
Rushing about I didn’t even rack Simons brains,,, maybe collect them next week somehow. If I’m into this I should really come see all the cars at Snetterton and take notes
Just confirmed with QBee I’ll pop up to Snetterton
Thanks Rev, I’ll look out for them.
I’ll start looking for rocker shafts Simon.
Just had a few hours at Powers and what fun I’ve had.
Used Dom’s blasting machine to proper clean my inlet manifold, borrowed/ robbed a 45 mm manifold for dimensions and something to work too.
I’ve got to go over and paint the walls to pay for all this brain stealing I’m doing
Anyway Jason set me up and here’s my porting that wasn’t finished but I thought I’d see what it turns out like with some proper blasting /cleaning.
I’ll do the heads next week when I’ve got valves out. Wait til you see those babies.
Never say never I say
I’ll start looking for rocker shafts Simon.
Just had a few hours at Powers and what fun I’ve had.
Used Dom’s blasting machine to proper clean my inlet manifold, borrowed/ robbed a 45 mm manifold for dimensions and something to work too.
I’ve got to go over and paint the walls to pay for all this brain stealing I’m doing
Anyway Jason set me up and here’s my porting that wasn’t finished but I thought I’d see what it turns out like with some proper blasting /cleaning.
I’ll do the heads next week when I’ve got valves out. Wait til you see those babies.
Never say never I say
Edited by Classic Chim on Thursday 19th April 17:48
Sardonicus said:
Yes Alun thats my engine, the adjustable bit is useful for me because of the mechanical/solid cam no faffing with adjustable push-rods 
agree with Rev-erend Kenne Bell are also fine RR's if your going the Yella Terra route start looking for new old stock rocker shafts mine are old stock genuine Range Rover items no point putting new rocker arms on old shafts IMO (unless you want to fk-em up of course) outrigger posts are available and just need a minor fettle to fit,, those spacers between the rocker arms I had made just because I could they are not essential however but why not? .......... and even less needed for moderate cam grinds or more sedate RPM use , I intended to use regular high RPM so it was a no brainer for the outlay and trouble
I get all that about the spacers and outrigger posts as I talked to Peter earlier.
Those spacers are bang on
Desperate for a valve spring compressor now as I can’t wait to clean the heads up so I can make some marks that will need working I might rent workshop space and his tooling at Doms to do at least one head there so I don’t fk it up.
Infact the inlet manifold I’ve borrowed was ported by one of the guys who’s been there like 20 years on and off, he did it all those years ago.
Also I looked at the one they have cut down into the runners until it’s broken through. Gives me a clear idea of which runners to be very careful with.
It’s worth some money I know that
agree with Rev-erend Kenne Bell are also fine RR's if your going the Yella Terra route start looking for new old stock rocker shafts mine are old stock genuine Range Rover items no point putting new rocker arms on old shafts IMO (unless you want to fk-em up of course) outrigger posts are available and just need a minor fettle to fit,, those spacers between the rocker arms I had made just because I could they are not essential however but why not? .......... and even less needed for moderate cam grinds or more sedate RPM use , I intended to use regular high RPM so it was a no brainer for the outlay and trouble I get all that about the spacers and outrigger posts as I talked to Peter earlier.
Those spacers are bang on
Desperate for a valve spring compressor now as I can’t wait to clean the heads up so I can make some marks that will need working
I might rent workshop space and his tooling at Doms to do at least one head there so I don’t fk it up. Infact the inlet manifold I’ve borrowed was ported by one of the guys who’s been there like 20 years on and off, he did it all those years ago.
Also I looked at the one they have cut down into the runners until it’s broken through. Gives me a clear idea of which runners to be very careful with.
It’s worth some money I know that
Edited by Sardonicus on Thursday 19th April 15:48
Standard inlet manifold ports
Against nearly completed ports matched to the largest gaskets that are also chopped out by about 1.5 mm so as big as they get
I’ll be removing my heart shaped groves for the more accepted flatttened option too.
Proper into this now I am, what a great hobby, just got to get off my arse and start grafting. Porting is proper mental and physical graft. Hours and hours of it but worth every second when it starts to look good.
Mega.
Against nearly completed ports matched to the largest gaskets that are also chopped out by about 1.5 mm so as big as they get
I’ll be removing my heart shaped groves for the more accepted flatttened option too.
Proper into this now I am, what a great hobby, just got to get off my arse and start grafting. Porting is proper mental and physical graft. Hours and hours of it but worth every second when it starts to look good.
Mega.
First one too, I’m well pleased seeing it with a finished look, got more digging to do to get uniform but overall looks A one to me.
I’m now collecting the ruddy things, incl my own I have 4 in total
I’m gagging to pull these heads apart too.
I think I’ll go borrow some tools off a mate tomorrow if I get time
I’m now collecting the ruddy things, incl my own I have 4 in total
I’m gagging to pull these heads apart too.
I think I’ll go borrow some tools off a mate tomorrow if I get time
I read stuff about this years ago on here but understood little of it.
It’s only when you want to do something do you take any of it in.
Yella Terra
The pedestal ends spread the weight over a larger area and stop the risk of the rocker shafts rocking on their small mounts.
The washers or shims inbetween each sexy aero grade rocker are bespoke so you measure and fit them to suit so you get Perfect centreing of rocker over each valve.
Red hot is what they are if expensive.
I have no idea what I’m doing other than listening to other people and doing what is the norm for any 5.0 set of heads really.
I’d really like to take a look at some 5.0 heads before long too. Dom might have an old one I can measure up
It’s only when you want to do something do you take any of it in.
Yella Terra
The pedestal ends spread the weight over a larger area and stop the risk of the rocker shafts rocking on their small mounts.
The washers or shims inbetween each sexy aero grade rocker are bespoke so you measure and fit them to suit so you get Perfect centreing of rocker over each valve.
Red hot is what they are if expensive.
I have no idea what I’m doing other than listening to other people and doing what is the norm for any 5.0 set of heads really.
I’d really like to take a look at some 5.0 heads before long too. Dom might have an old one I can measure up
Edited by Classic Chim on Thursday 19th April 23:26
You’ve got to love PH
Starts out as a scratch of an inlet manifold and actually I only started this so I could have a cool looking fuel rail
So far the shopping list extends to full blown ported heads and manifold
Act big bore manifolds !!!
Yella Yerra rocker system
Now Roller cam added to the list.
If you could make up the perfect shopping list these things would surely be on it
Keep the ideas coming
Starts out as a scratch of an inlet manifold and actually I only started this so I could have a cool looking fuel rail
So far the shopping list extends to full blown ported heads and manifold
Act big bore manifolds !!!
Yella Yerra rocker system
Now Roller cam added to the list.
If you could make up the perfect shopping list these things would surely be on it
Keep the ideas coming
|https://thumbsnap.com/fSvhUKyx[/url]
Your only as good as the equipment you use.
A massive Thankyou to Powers Performance, Dom Jason and Wayne for showing me what to do and how to turn on the compressor
If I work a big list Dom will have to find me some work to pay for it,,,, simples
That’s my plan anyway, not sure thats his yet
The way I look at it there’s no free lunches and I’ll do some work for Dom to pay for it.
As he’s based in a city people often walk in off the street and he’s always doing things for people that we all never really get to see.
Less fortunate, I did spend 20k there over the years but yes he’s being very kind.
He’s so busy but the lads are really cool there and point me in the right direction.
As he’s based in a city people often walk in off the street and he’s always doing things for people that we all never really get to see.
Less fortunate, I did spend 20k there over the years but yes he’s being very kind.
He’s so busy but the lads are really cool there and point me in the right direction.
Edited by Classic Chim on Saturday 21st April 13:46
QBee said:
That’s the Alun I know, always wanting to to be at least fair and pay his way.
My mower is working again. I took it into the local repair place earlier in the week, not starting. Knew it was fuel related, as it had a dry spark plug despite it having fuel and me cranking it like a whirling dervish. Bloke said “4 weeks mate, not surprisingly I am overrun with mowers right now”.
He called me yesterday to say it was fixed. Blow me down with a gnats backfire.....
Turned out the carburettor was flooded, and petrol mowers don’t run on water. Somebody must have left it out in a thunderstorm. Not that I am blaming my son in law.......
Water in the mix ain’t good. My mower is working again. I took it into the local repair place earlier in the week, not starting. Knew it was fuel related, as it had a dry spark plug despite it having fuel and me cranking it like a whirling dervish. Bloke said “4 weeks mate, not surprisingly I am overrun with mowers right now”.
He called me yesterday to say it was fixed. Blow me down with a gnats backfire.....
Turned out the carburettor was flooded, and petrol mowers don’t run on water. Somebody must have left it out in a thunderstorm. Not that I am blaming my son in law.......
Charge his account
! Thing is there’s got to be 10 people at least employed at Doms garage, that’s a big wage bill every week.
All I can say if he jacked in thousands of owners would be worse off.
He’s not expensive either when you look into it.
Parts are a bit steep at times but I know the lengths they go to to approve parts that actually work, I’ve seen Andy show some stuff he can get as suppliers are scarce and Dom reject them saying they’ll be coming back f
ked in know time yet others are happily selling the same stuff! The rebuilt 4.0 engine Chim running Mbe today, should have heard how sweet and quiet the engine was.
You can’t help but be impressed.
Them there’s the Cerb that came as a bag of bits and someone’s got to work out what they all are. Carpet pieces etc. Not easy when you didn’t take it apart.
Big challenges as Matt will know.
Anyway now I’ve found the cleaning machine im putting an ad in the papers for perfect engine part cleaning services,,, Dom can charge me then
Last few pics of a standard late head with intermediate sized valves.
These are as as good as it gets for Rover heads as standard I believe.
It was mentioned to me that knobby who works at Powers did all the porting and polishing back in the day on these heads so I’ve now decided it’s to easy to wreck them with one wrong move ( it’s highly skilled stuff welding cutting tools! )
I’m going to twist his arm ( bribe him ) into giving me some lessons.
I’ll hopefully do a few for Dom to pay for it sometime when I’ve proved my worth
At some point I must have dragged the head across something, use your brains when handling these especially face down ffs.
These are as as good as it gets for Rover heads as standard I believe.
It was mentioned to me that knobby who works at Powers did all the porting and polishing back in the day on these heads so I’ve now decided it’s to easy to wreck them with one wrong move ( it’s highly skilled stuff welding cutting tools! )
I’m going to twist his arm ( bribe him ) into giving me some lessons.
I’ll hopefully do a few for Dom to pay for it sometime when I’ve proved my worth
At some point I must have dragged the head across something, use your brains when handling these especially face down ffs.
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