More cam endfloat
Turbo Mini Forums

It seems I have no cam endfloat, so I made some 6 thou shims to put between the thrust plate and front plate just for measurement and 6 thou seems ok as 3 - 7 is standard
What is the best way to increase the float? I was thinking maybe a thicker gasket.

Paul

I seriously doubt it!

Are you using the thin paper gaskets or the cardboardy stuff?

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


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Thin paper.
I think my carbon fibre front plate may be a few thou thinner than the original steel and my old alloy one

Edited by paul wiginton on 29th Mar, 2011.

I seriously doubt it!

the gasket shouldnt effect it,

you can either thinn the triangle down or take a little off the timing gear on the step, (not the bit that pokes through the triangle)

Edited by Joe C on 29th Mar, 2011.

^^^

As Joe says, the gasket has no effect on end float.

Different gaskets mess up the alignment between crank sprocket and cam sprocket so all sorts of different shims are required on the crankshaft but end float of the cam is simply thickness of the triangular plate vs height of the small step on the photo above.

Beware of thinning the triangle, one side of it is whitemetal faced.....

Schrödinger's cat - so which one am I ???

The issue is no float before the sprocket is fitted which is why I was thinking a thicker gasket to space the front plate from the block and cam

I seriously doubt it!

Ah,

there should be tons without the sprocket on,

Cam tight on the oil pump drive maybe?

Pretty certain its because the carbon front plate is slightly thinner than standard.
Its the same cam, pump and thrust plate as before which had 4 thou iirc

I seriously doubt it!

Ah! non standard parts!

In that case I'd look at taking a sniff off the cam drive, sounds like it may be bottoming out now,

I've got the same issue with my med alloy backplate, yes you need shims between backplate and triangle to the required end float.

Class C 3rd Place Avon 2011 14.18 @101mph

You only want to brag about your carbon front plate Why not slim down the triangular thingy?

Edited by Vegard on 30th Mar, 2011.

If I slim down the thrust plate (triangular thingy Vegard) it will make no difference at all as it sits hard against the cam

I seriously doubt it!

Maybe a bodge, but two gaskets under the front plate (or make a thick one from scratch)?

Sorry - just re-read your original post!

Edited by graemec on 31st Mar, 2011.

Yes Paul, but it's the clearance between the cam and cam drive that determine the endfloat right? Ok, so shims between the cam and the gear would obviously increase the endfloat. What makes you think you've got too little? If the cam turns will it lock against the oil pump when hot?

Schrödinger's cat - so which one am I ???

I put another gasket behind the front plate and its sorted now.

I seriously doubt it!

The oil pump and cam have not been removed from the engine. Im only replacing the front plate and timing gear with lighter ones.

Having a proper blondie with all this. Ive built the engine loads of times and done cam timing dozens of times.
Last July I checked the timing before Avon and it was 106 degrees, I did the one event and the car hasnt turned a wheel since. This week I took off the Swifty steel/alloy timing gear to replace the front plate and fit the new Swifty alloy/alloy timing gear. I didnt turn the engine but the cam timing shows at 160 odd degrees. Took off the chain again, realigned the dots again and it still shows 160 odd degrees.
Ill have to think about this one and do it tomorrow with a clearer head.
Very odd as the engine has not turned.

I seriously doubt it!

More to the point, I thought you hated carbon fibre.

In the 13's at last!.. Just

Ive painted it green, you cant tell and it weighs less than 140 grams including the titanium studs and countersunk screws

I seriously doubt it!

Very fancy.

In the 13's at last!.. Just

Chances are the key slot in the gear is cut in a different place.

I had an SW5 that had the keyway cut about 17 degrees out - too far for the adjustable sprockets to take up the difference and I ended up wth offset keys as well as adjustable sprockets.

Chances are the key slot in the gear is cut in a different place.

I had an SW5 that had the keyway cut about 17 degrees out - too far for the adjustable sprockets to take up the difference and I ended up wth offset keys as well as adjustable sprockets.