They are dreaming!

Cams and ecu will be part of a phase 2.

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

The reason I asked if it was measured with the valves in is because at some point there will always be a set of valves under tension there for putting pressure on the other end of the cam shafts.
I agree with the others and that the oil gap is not so critical with the cams as the mains and big ends and that it’s the total gap.
Obviously there is some concern over the caps being used in the wrong location, may be check your oil gaps again without any valves on cam and see what the gaps are again, you might find that those that are just out might be ok. Dorris
PS. Mike, are you old school and work in feet and inches?

_________________
Black CS 2771

Cheers Dorris.

No not old school - just was the measurements on the plastigauge!

Give me metric anyday!

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

Plastigauge usually has thou on one side and mm or microns on the other.

_________________
If at first you don't suck seed, try drier grain.

Chris - can you clarify what you mean by the above? I have remeasured the inlet cam so far doing just one side at a time.

For example on journal 1 I have measured the clearance on the head to be 0.025mm and the clearance on the cap to also be 0.025mm. Am I adding these together or subtracting one from the other?

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

Sounds like you've done it correctly.

For example, you have a piston that's 86.4mm diameter and a specified oil clearance of 0.1mm then you bore at 86.5mm, leaving 0.05mm each side.

What it DOESN'T mean is 0.1mm each side so bore at 86.6mm.

The way I would normally measure cam bearing clearance is to lay the cam in the head, put platigauge on each journal at the top then fit all bearing caps as specified in the handbook, then undo all and read the sizes.

It's vital to ensure all components are clean & free from dust when assembled as this will affect the reading.

_________________
If at first you don't suck seed, try drier grain.

Thanks Chris.

I have been fastidious about cleanliness and have used a lot of cleaner and blue roll in the process!

I'll measure the exhaust cam this afternoon and post up the results.

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

You used to be able to get pressure sensitive plastigauge (for want of a better name)

This changed color depending on clearance so you could see if components had worn in to each other

I have no idea where it came from, I used it in an aerospace environ so it might not ne available to Joe public

Would be ideal for checking your stuff Mike as it showed uneven wear patterns very well

I've just finished remeasuring the camshaft clearances doing only one side at a time.

I also realised I made a mistake - when i posted up originally ages ago about some of the caps being in the wrong order, I forgot that they had also been entirely changed - exhaust caps on the inlet cam. The original figures I posted up were with the caps in the right order but on the wrong camshaft.

I rectified this and remeasured:



This would seem to me that whilst the inlet camshaf is mostly fine - the exhaust is way out of the BGB spec (0.025 - 0.062), by almost double on most of the journals.

Thoughts anyone?

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

Mike,
I have no experience of measuring really but my logic tells me you have measured the same clearance twice?

If you only use one lot of plastiguage on one side then surely the cam can move so you measure the total tolerance? i.e. removing it and measuring the other side will result in twice the clearance?

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

I don't know either

_________________
GT4DC Events Co-ordinator
1996 ST205 UK

FFS pick up the phone and call Terry Tiddlywink

.....or Jon, but please put an end to our agony

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Fwiw I was learned to measure both sides then take the worst SINGLE measurement

Each measurement does indeed take the TOTAL clearance as the back of the camshaft will move to touch the opposite side of the bearing. You will get some discrepancy if the camshaft or head is not straight, or the valve springs are applying force in one direction.

On the face of it, No.5 exhaust is the only worrying one at 0.125

Happy to act as carrier to Terry next time I'm passing.

_________________
If at first you don't suck seed, try drier grain.