valve guides

bones · Post by **bones** » Mon Dec 22, 2008 11:35 am

just a simple one ,and im not talking about me,

, Should the valve guides be the same level as each other at the top, some of my ones sit higher than the others.

rich

ChrisJC · Post by **ChrisJC** » Mon Dec 22, 2008 1:09 pm

They should all be the same. For the later type that take the neoprene oil seal, the top of the guide should be 15mm from the valve spring seat.

Chris.

bones · Post by **bones** » Mon Dec 22, 2008 1:28 pm

Cheers Chris, there old sd1 heads with shortened valve guides fitted, i better get them checked out, there is about a 1mm difference in them.

rich

CastleMGBV8 · Post by **CastleMGBV8** » Mon Dec 22, 2008 1:33 pm

Rich,

Bear in mind that depending on your cam choice and lift, you may have to machine a 100 thou. or so from the top of the guides anyway.

Kevin.

bones · Post by **bones** » Mon Dec 22, 2008 1:45 pm

These were the guides to be used with a typhoon cam, and the next cam isnt going to be as higher lift, a crower 50230 but that could be the wrong number as ive lost the bit of paper

rich

ChrisJC · Post by **ChrisJC** » Mon Dec 22, 2008 2:20 pm

I wouldn't worry about 1mm. I thought you meant like 5mm!

As said above, the most important thing is to make sure that the valve cap won't hit the oil seal (or guide top) at maximum valve lift.

Chris.

bones · Post by **bones** » Mon Dec 22, 2008 3:28 pm

Ive checked them again, and they are no more than a 1mm down from the highest ones, so will leave them, thanks for the help guys,

rich

topcatcustom · Post by **topcatcustom** » Mon Dec 22, 2008 6:39 pm

If they are pressed in can't you adjust them by pushing them in or out a bit? Also is it easy to change them in a press yourself? Thinking about bullets of course!

ChrisJC · Post by **ChrisJC** » Mon Dec 22, 2008 9:02 pm

topcatproduction wrote: Also is it easy to change them in a press yourself? Thinking about bullets of course!

Yes, just changed all mine for some shortened ones. I used a 12tonne press from Machine Mart, and made up all the necessary drifts and jigs to hold it all properly.

One or two took some force to get moving, but it all worked pretty well.

I'll post some pics at some point.

Chris.

topcatcustom · Post by **topcatcustom** » Tue Dec 23, 2008 9:27 am

I suppose it would be even easier if you put the heads in an oven for a while first, was thinking about bulleting some on our lathe (or just getting some bulleted ones!)

How much power could bulleted guides save- plus a bit of opening up around them before they're fitted...

ChrisJC · Post by **ChrisJC** » Tue Dec 23, 2008 10:02 am

I didn't bother putting it in the oven, it just makes it hard to handle it! And by the time you've faffed around, it's cooled down anyway.

I shortened and bulleted mine with an angle grinder and bench grinder.....

Chris.

topcatcustom · Post by **topcatcustom** » Tue Dec 23, 2008 1:01 pm

re-use the old ones providing they're not worn? Dont know how cheap new ones are saying that! Did you do all the pushing from the top?

ChrisJC · Post by **ChrisJC** » Tue Dec 23, 2008 2:16 pm

I wouldn't re-use them. They are only a couple of quid each.

I pushed them from the port side towards the valve-spring side.

Chris.