Valve to piston clearance

Valve to piston clearance

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Discussion

Pupp

12,351 posts

278 months

Tuesday 3rd March 2015
quotequote all
db484bhpv8 said:
I guess thats why more clearance is given to the exhausts then.
That, and to allow for wear in the valve-gear drivetrain (ever seen how much an Rv8 cam chain can 'stretch'?) wink

db484bhpv8

Original Poster:

8,669 posts

226 months

Tuesday 3rd March 2015
quotequote all
Pupp said:
That, and to allow for wear in the valve-gear drivetrain (ever seen how much an Rv8 cam chain can 'stretch'?) wink
Yes quite shocking at times.
I will be checking my timing again even if i dont swap the cam.
Maybe explains why my inlets are worse than the exhausts by 2mm.

I also need to inspect my rocker shafts. One thing that hasnt been replaced by myself on this engine since i aquired it.

Pupp

12,351 posts

278 months

Tuesday 3rd March 2015
quotequote all
You maybe have them already Derek, but if you rev it out routinely, well worth changing the end pedestals for the billet outrigger types available from JE and others

db484bhpv8

Original Poster:

8,669 posts

226 months

Wednesday 4th March 2015
quotequote all
Pupp said:
You maybe have them already Derek, but if you rev it out routinely, well worth changing the end pedestals for the billet outrigger types available from JE and others
May as well order a set of these. Would it be prudent to order JE's billet shafts too?

Slight change of plan.... the pistons are going to David Knights. After doing my cylinder heads he offered to do the reliefs at a very fair price.
ie the JE pedestals will almost be free. Got to love man maths.

phazed

21,979 posts

210 months

Wednesday 4th March 2015
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Be prepared to ease the insides of the pedestals as mine were too tight a fit on the shafts, even with heat!

A small flapper wheel is your pal.

Pupp

12,351 posts

278 months

Wednesday 4th March 2015
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Never seen any JE shafts but doubt they'd disappoint if available. That said, if the new pattern shafts I have ready to go in ('Allmakes' brand) are typical, I can't really see the necessity as they are solid enough and seem accurately sized against the YT rockers.

As Peter says, the outrigger posts are very tight and may need letting onto the shafts (not sure I'd use anything as aggressive as a flap wheel 'though); have certainly heard of posts cracking through trying to be installed too tightly so needs doing right.

phazed

21,979 posts

210 months

Wednesday 4th March 2015
quotequote all
I had a post crack after fitting!

By flapper, i made a home made small one that took very fine emery, perfect to tickle the inside....

ClassiChimi

12,424 posts

155 months

Wednesday 4th March 2015
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hehe
Other than make me laugh my head off I've learnt so much from you chaps.

db484bhpv8

Original Poster:

8,669 posts

226 months

Friday 6th March 2015
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in the post to David Knight.

New stuff





Edited by db484bhpv8 on Friday 6th March 17:02