rocker choices
rocker choices
Author
Discussion

clive f

Original Poster:

7,259 posts

262 months

Monday 27th November 2006
quotequote all
okay guys, I could do with some help in making a decision in what type of rockers to put in my griff 500, ally or steel?
I`ve spoken to several specialists this morning, some recomend the ally ones some say steel, but overall the biased seems to be towards the aluminium ones.

the experts have a hell of a lot more knowledge on this than I ever will, so I`ll probably get the aluminium ones but would appreciate anyones input, experiences on this one.

simon.b

1,230 posts

311 months

Monday 27th November 2006
quotequote all
The steel pads in my ally ones broke up, is this your reason for change, I had the full set replaced 20,000 miles ago with what I belive were the same standard Griff parts, ally with steel pads by TMS as was. Still no rattles….

Cheers,

Simon.

Oop's shouldnt read the post's from top down, soz.

Edited by simon.b on Monday 27th November 13:16

350matt

3,896 posts

308 months

Monday 27th November 2006
quotequote all
You can help the rocker problem by fitting a set of uprated cro-moly pushrods thes edon't flex so much as std ones and stop the rocker from 'chattering' against the valve tip

Matt

clive f

Original Poster:

7,259 posts

262 months

Monday 27th November 2006
quotequote all
Ive surrendered the credit cardhehe and ordered up a cam kit, with new ally rockers and adjustable push rods, had so many choices in front of me it was getting really confusing, but decided to go with Chris`s advice from rpi engineering, top man, managed to get hold of him on the phone late saturday morning when I discovered the problem, then he phones me from his home late in the afternoon to check on my progress with stripping the engine down, lots of invaluable advice, so I think he deserves my custom for that reason alone.

hope to get things back together in the next couple of weeks.

rev-erend

21,619 posts

313 months

Monday 27th November 2006
quotequote all
Adj. push rods ..

Are you going to a solid lifter cam..

They always look like the adjustment would be really fiddley.

How about the Yella Terra roller rockers - adjustable alloy rockers.

clive f

Original Poster:

7,259 posts

262 months

Monday 27th November 2006
quotequote all
its a piper 285 cam, just thought that the adjustable push rods will give better individual adjustment rather than working to averages with the shims.

GreenV8S

31,017 posts

313 months

Monday 27th November 2006
quotequote all
clive f said:
its a piper 285 cam, just thought that the adjustable push rods will give better individual adjustment rather than working to averages with the shims.


You have to open the pushrod holes out to fit them, and they're heavier and more flexible than solid pushrods. I don't think they're a good idea unless you're running solid lifters.

clive f

Original Poster:

7,259 posts

262 months

Wednesday 29th November 2006
quotequote all
thats a good point which I hadn`t thought of, only using the standard lifters, I`ll get on the phone to see if I can cancel them, I dont want to start drilling out the holes!

clive f

Original Poster:

7,259 posts

262 months

Wednesday 29th November 2006
quotequote all
to late, they are on their way!
but they are sending out a set that fit in the holes without any drilling out, so would appreciate some advice peter,
why do you ask about solid lifters, the pushrod adjustment only saves shims under the rockers?
when you say they are more flexible, have you had any bad experiences with these?
the supplier, expresses no concerns with fitting these at all, would appreciate your input.

thanks, clive.

markh

2,781 posts

304 months

Wednesday 29th November 2006
quotequote all
Have a set on Yella Terra roller rockers in my Chimaera

GreenV8S

31,017 posts

313 months

Wednesday 29th November 2006
quotequote all
markh said:
Have a set on Yella Terra roller rockers in my Chimaera


Did you have any trouble getting them to fit under the original rocker covers?

markh

2,781 posts

304 months

Wednesday 29th November 2006
quotequote all
Hi Pete, yes they fitted fine, I have the cast TVR rocker covers, don't know if they are different.

Mark

dnb

3,330 posts

271 months

Friday 1st December 2006
quotequote all
I think London Thunder and a few thousand miles of commuting have done for the rockers in mine now. Still, 104k miles isn't bad...

Must catch up with you to see how you're getting on - specially now this is on the top of my job list.