goaty
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| posted on 10/4/09 at 05:56 PM |
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Pinto head work
Hi,
Can anyone tell me if it is poss to change a pinto camshaft and valve springs without taking the head off??
I have just about enough room to squeeze the cam out just not sure on the valve springs. I am wondering if i can do a cylinder at a time using the
piston to kepp the valve up, just not sure if its poss to compress the springs enough to get the collets back on....
I am tempted to change my cam or a FR33 KC as mine seemed to prodice good power and torque, just fancy a little more. Plus i still cant find any info
on the cam thats currently in there.
Many thanks in advance
goaty
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NS Dev
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| posted on 10/4/09 at 05:59 PM |
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anything's possible, but it would be FAR easier to just take the head off!
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omega0684
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| posted on 10/4/09 at 06:11 PM |
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^^^^^^ agreed, buy a new head gasket and just take the head off, it will also give you the oppotunity to examine the cylinders and pistons as well.
[Edited on 10/4/09 by omega0684]
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goaty
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| posted on 10/4/09 at 08:30 PM |
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ok, thought that may be the case.
Not sure now if its worth taking off or not.
Would prob be a wiser move to settle for it as it as and use the money it would cost for a new cam etc and put it towards the next engine
upgrade....16v power.
Quite a bit of work to get the head off as i just spent the money having it set up as it is, i think the cam in it must be a torquey cam as it peaks
at 6095rpm.
Going back to have it set up again with a better inlet manifold though so was contempalting the cam change....
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richard
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| posted on 10/4/09 at 09:20 PM |
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I understand you can do what you want but only by geting a fitting to go in the spark plug hole that can take a compressed air fitting. The air
pressure is used to hold the valve up on it seat. you then need a special tool to be able to compress the valve spring, not sure where to get this as
different to the normal valve spring compressor.
My bet would be to take the head off, but you need a spline tool for this as well on older heads
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perksy
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| posted on 10/4/09 at 11:44 PM |
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Can be done using compressed air with the correct adaptor/s
Have also seen this done using String threaded in through the spark plug hole
(you use the string to 'compress' the valve so it doesn't move)
But if you want to check the head over aswell and maybe regrind the valves in at the some time, it's head off time...
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snapper
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| posted on 11/4/09 at 11:46 AM |
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If its a standard head it would be worth skimming a bit off to up the compression ratio say about 1mm, this and a head gasket that crushes to 1mm will
give about 10.2 to 1 compression ratio ideal for 95RON unleaded
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goaty
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| posted on 11/4/09 at 07:06 PM |
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its a big valve flowed head. and i think i will jst leave it as it is for now once i put the new inlet manifold on it.
Not worth taking the head off if theres no need for it other than trying gain a few hp. Its been skimed before so dont fancy that either.
If i do need to take the head off at somepoint i will think about a new cam then i think, the new inlet should help a few more hp i hope. Will find
out in a few weeks and go back to HT.
cheers for all the input, i think i may look into the tools to do it in situ, some of them sound interesting. 
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