45mm inlet and Plenum base inc 72 mm throttle pot.
Discussion
QBee said:
Matthew Poxon said:
I am inspired by your head project Alun. Well done sir.
I agree - I have often wondered if Alun’s head needed a bit of attention......
You’ve both met me,,,,who am I to argue.
Thanks Matthew, I draw a lot of inspiration from many places including your great car.
This is all made possible by other Tvr friends at the end of the day.
I’d never take it further than an idea without the support of a number of people so they are my inspiration and really why I can start on this path.
I have grave doubts too mind.
There’s not a chance I’d touch what Dom’s boys did with the standard stuff hence replacements so it can be reversed.
All I know is if I can hold onto what I’ve got +20 hp I will be faster and beat my own time
I have to prove it works for a start.
Let’s see before I puff my chest out to far!
In the scale of things in life this is low on the list but hi on my bucket list so as I’ve learnt everything can change in a second, live now and do what you can within your means.
I’m only doing what I’ve read all before me have done and have a deep respect for.
The blokes who learn then create some masterpieces are my inspiration.
Everytime you see or read of an owner doing things to these cars it inspires me.
I actually need a girlfriend but that can wait until this is finished as all the moaning gets on my tits
Having had an ambition since a young boy to own such a car as a Tvr then fulfilling that dream was one thing.
To slowly learn about it and now start to work on it myself is just great fun.
I’m very conscious of the huge investment in this car via professional help and upgrades that’s given me this platform, I’m also very greatfull of the work that’s been done too.
But there comes a time where you either don’t have the money ( my case) or you just want to get more involved with the car ( also my case) so doing as much yourself is the only way to do it.
I’ve read my first post on this thread late in January.
Writing is hard for me as I’m thick as f
k and often confuse words with thoughts, just read some of what I’ve written, miles off fact! But only weeks later I feel my knowledge has jumped a notch,
Who’d ever see me studying flow dynamics or Ve,,, didn’t even know what that meant a few weeks ago,, now it’s a personal goal to get the best Ve I can.
There’s a side of me housed with this new found blip of info that thinks I should make a 38 mm inlet system that flows at its best and just add to my cars base ability for the road.
But I also like the racer banter so this is my little way of competing and having the craic with it.
Jackson 4 is my real inspiration as he did his himself ( he’s skilled mind
) And f
ks me off coming past me on the drag strip every time 
I’ve witnessed and felt the extra power these mods give by just looking over my shoulder
“biglaugh: We all do such good jobs with these cars I can be beat and still enjoy the fun. But not so often
I have an ambition and when it’s fulfilled I’ll probably remove the lot and let someone else have it as I really like my economy but maybe once it’s on I’ll love it.
From the basics I’ve learnt so far I’m also really into the idea of making a high flowing but turbulent 38mm manifold matched to my heads and seeing if I can get over 30 mpg and zero shunt from 750 revs and still have over 300 hp and masses of torque.
That’s also a very impressive stat as getting power is easier than getting a good burn low down the revs.
Who’d have thought that out of an old Rover efi engine with that kind of power.
I need to get a life
Edited by Classic Chim on Saturday 24th March 20:02
Edited by Classic Chim on Saturday 24th March 20:08
Steve_D said:
For the battery drain get one of these.
https://www.ebay.co.uk/itm/Car-Fuse-Current-Amp-Me...
The ebay link is for a pair of testers one standard fuse size the other mini fuse.
You just plug it in in place of the fuse. The added advantage is you can also check to see if the fuse you had fitted was way bigger than the current the circuit is pulling when everything it supplies is turned on.
Steve
Good bit of kit that https://www.ebay.co.uk/itm/Car-Fuse-Current-Amp-Me...
The ebay link is for a pair of testers one standard fuse size the other mini fuse.
You just plug it in in place of the fuse. The added advantage is you can also check to see if the fuse you had fitted was way bigger than the current the circuit is pulling when everything it supplies is turned on.
Steve
jojackson4 said:
How’s the cleaning going
I may just piss you off tomorrow
Waiting for better tooling to arrive,,, a week next Tuesday!! I got the dates wrong. I may just piss you off tomorrow
Hear we go,,,, what cheating mod have you got now.
Can’t wait and you know it,,
Edited by Classic Chim on Wednesday 28th March 00:22
After what felt like weeks of waiting these bits turned up on Saturday as well as a pair of heads from Phazed that I nicked off his shelf.
I can really do some damage now with these extended bits.
Very exciting stuff.
Simon mullered me on Saturdays drive out coming past like I was stood still,,, I was in the wrong gear I’m sure if it
I was well chuffed as he’s done most of what I’ll be learning to do here on his car long ago.
It works there’s little doubt of that.
Burr grinders
I can really do some damage now with these extended bits.
Very exciting stuff.
Simon mullered me on Saturdays drive out coming past like I was stood still,,, I was in the wrong gear I’m sure if it
I was well chuffed as he’s done most of what I’ll be learning to do here on his car long ago.
It works there’s little doubt of that.
Burr grinders
Yep no worries.
I might have a go tomorrow evening but I’ve sort of bottled it for now!
I’ve just concentrated on marking head ports and trial lining up inlet manifold. Defo need a camera app !
I need a valve spring compressor for the heads which I’ll borrow off Neal1980 as buying one seems pointless at this time.
As these heads have no rockers or shafts I’ll have to source these at a later date and inevitably I start thinking about YELLA TERRA roller rockers, the holy grail for rocker assembly on these style heads, can you run softer springs with these
What’s the pros,,, and cons.
If your going to do something you might as well do the best or what’s the point!
Might take longer but the rewards should be more than worth it.
325-340 hp could well be achievable with all these tweaks in place on the right engine.
Better stop talking and start digging,,,, good advice, wear masks as micro bits of Alloy fill the air!
I might have a go tomorrow evening but I’ve sort of bottled it for now!
I’ve just concentrated on marking head ports and trial lining up inlet manifold. Defo need a camera app !
I need a valve spring compressor for the heads which I’ll borrow off Neal1980 as buying one seems pointless at this time.
As these heads have no rockers or shafts I’ll have to source these at a later date and inevitably I start thinking about YELLA TERRA roller rockers, the holy grail for rocker assembly on these style heads, can you run softer springs with these
What’s the pros,,, and cons.
If your going to do something you might as well do the best or what’s the point!
Might take longer but the rewards should be more than worth it.
325-340 hp could well be achievable with all these tweaks in place on the right engine.
Better stop talking and start digging,,,, good advice, wear masks as micro bits of Alloy fill the air!
SILICONEKID 345HP 12.03 said:
What heads are they Alun ? Looks like I'm going to be in your fear view mirror
I need some forged bits if i’m going for your compression ratio I don’t think I’ll get near your figures Daz.
The heads are the ones pictured on page 10 of this thread, Peters heads he had lying about.
I can see myself being called to his place on many occasions to pay for it
I’ll be more than happy to oblige
They are the late efi heads and probably the same as my own heads as they came in around 1994 on RR stuff.
Has anyone got an exhaust manifold off the car they could measure the exhaust header size for me with an accompanying picture. If you happen to have an exhaust manifold gasket or even an old one, if you can offer that up to bolt positions so I can see the orientation and give me some idea of what size I can open ports too.
The exhaust ports on stage 4 heads are no bigger than the gasket which does allow me plenty of meat to remove but it’s all controlled by how big and matched I can make the exhaust headers. Seeing one of those with a gasket aligned will give me a good reference.
I’m hopimg they are somewhat larger than the ports so I can take the ports right out to gasket line.
Lots of thinking going on right now!
N/A for maximum efficiency wants good pulse length that helps purging. It is well known that long header exhaust pipes such as ours promote hp.
Peters promote that even further as they flow into the pipes that replace the Y piece so flow better than a Y piece.
If the exhaust manifold ports are not well matched to the head ports so present an instant restriction to flow and create turbulence as the gases hit say a step it will reduce power.
You rely on forced air producing power so overcome these restrictions quite easily.
It’s true to say though and if you fancy an experiment we can prove it but bigger heads that flow in and out better with bigger valves will give you extra power with the same boost. Less restriction just lets it’s spin up faster and takes less power off the engine trying to force air in and out.
More efficient.
You’ll be well over 400..... probably above 420 hp with this lot on,,,,
Peters not going to like this
I just want to prove I can do it.
Not without taking very informed advice which is really the secret rather than me coming up with anything new.
If you noticed the difference in the size of the inlet ports on Saturday you’ll see much more air can travel through them.
Win win.
Contrary to what your saying Anthony and YES Peters are big bore manifolds
They present even less restriction at the ports so the results he got on the rolling road were what I was hoping and half expecting to see.
The turbulence caused when each bank of headers meet the Y piece is going to be considerable.
His car should be quieter up front If a bit louder out the back if my theory is correct.
Peters promote that even further as they flow into the pipes that replace the Y piece so flow better than a Y piece.
If the exhaust manifold ports are not well matched to the head ports so present an instant restriction to flow and create turbulence as the gases hit say a step it will reduce power.
You rely on forced air producing power so overcome these restrictions quite easily.
It’s true to say though and if you fancy an experiment we can prove it but bigger heads that flow in and out better with bigger valves will give you extra power with the same boost. Less restriction just lets it’s spin up faster and takes less power off the engine trying to force air in and out.
More efficient.
You’ll be well over 400..... probably above 420 hp with this lot on,,,,
Peters not going to like this
I just want to prove I can do it.
Not without taking very informed advice which is really the secret rather than me coming up with anything new.
If you noticed the difference in the size of the inlet ports on Saturday you’ll see much more air can travel through them.
Win win.
Contrary to what your saying Anthony and YES Peters are big bore manifolds
They present even less restriction at the ports so the results he got on the rolling road were what I was hoping and half expecting to see.
The turbulence caused when each bank of headers meet the Y piece is going to be considerable.
His car should be quieter up front If a bit louder out the back if my theory is correct.
Edited by Classic Chim on Wednesday 18th April 21:35
Edited by Classic Chim on Wednesday 18th April 21:42
While my minds on the subject
There’s a few reasons why someone like me finds this stuff and using tools and hand crafting rewarding.
It’s not so much how much power you have but how efficiently it can do the work.
I’m looking into single valve springs for instance as the less energy you use up operating the engine the more energy the engine can produce.
I find the idea of making it efficient at making the power and especially flowing the gases in and out as smoothly as possible something well worth doing.
Port matching is about as funky as you can get on a car,,,, that’s what I think
There’s a few reasons why someone like me finds this stuff and using tools and hand crafting rewarding.
It’s not so much how much power you have but how efficiently it can do the work.
I’m looking into single valve springs for instance as the less energy you use up operating the engine the more energy the engine can produce.
I find the idea of making it efficient at making the power and especially flowing the gases in and out as smoothly as possible something well worth doing.
Port matching is about as funky as you can get on a car,,,, that’s what I think
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