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Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 12:38 pm
by PeterSM
I have just been checking my sprint car over ready for Sunday and discovered an issue. When I removed the dipstick it was covered with classic brown mayo. So I removed the rocker cover cap and checked that:
Dipstick.jpg
Dipstick.jpg (85.58 KiB) Viewed 330 times
Siphoned some water out of the header tank and it looks like this:
20190815_122334_resized.jpg
20190815_122334_resized.jpg (97.9 KiB) Viewed 330 times
Which leads me to think it is a head gasket issue but the compression test gives.
Cylinder PSI
1 135
2 130
3 140
4 160

Which seems OK.

Any thoughts?

I have now also pressurised the cooling system via the expansion tank cap to 15psi and it has held this pressure for over 8 minutes.

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 1:07 pm
by tony1966
do you have an oil cooler which is water cooled ? could be that if you have

on a static test any hg leaks might not show-but when warm and thousands of rpm with high cylinder pressures it may be passing

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 1:23 pm
by PeterSM
Thanks Tony. Yes Craig thought it might be the water cooled oil cooler. Guess I will have to try substitution to see if it is that.

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 1:27 pm
by Dcrosby13
I have a good spare cooler Peter and I recently replaced mine in situ but swore I'd never do it in the car again 😬 we can give it a go though!

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 1:32 pm
by PeterSM
If you can bring it to Curbs and give me a hand fitting I would be very grateful. It looks pretty inaccessible!

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 2:49 pm
by CNHSS1
Get the car to Curbs and the compie collective will have it repaired I'm sure 8)

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 2:51 pm
by Dcrosby13
PeterSM wrote:
Thu Aug 15, 2019 1:32 pm
If you can bring it to Curbs and give me a hand fitting I would be very grateful. It looks pretty inaccessible!
Thats putting it mildly :lol: I think this time I will remove the engine mount first

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 2:52 pm
by PeterSM
Its on the trailer plus my canopy to work under!

If it was the water oil cooler wouldn't the pressurising of the water system leak down?

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 2:55 pm
by Dcrosby13
we could do with a gasket or atleast some hi temperature silicone if you could bring that along with a socket set?

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 2:57 pm
by Dcrosby13
I would have thought so tbh, it could still be the headgasket, it might just have gone between a water way and an oil gallery and not the flame ring which would mean your compression would be unaffected, I would swap the headgasket first...
PeterSM wrote:
Thu Aug 15, 2019 2:52 pm
Its on the trailer plus my canopy to work under!

If it was the water oil cooler wouldn't the pressurising of the water system leak down?

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 3:06 pm
by Dcrosby13
and be a very small slow leak that might have been going on for a while

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 3:07 pm
by Nick
Bypass oil cooler, change oil, filter and water

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 3:32 pm
by efi_sprintgte
Nick wrote:
Thu Aug 15, 2019 3:07 pm
Bypass oil cooler, change oil, filter and water
Agreed

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 3:39 pm
by PeterSM
Nick wrote:
Thu Aug 15, 2019 3:07 pm
Bypass oil cooler, change oil, filter and water
OK I can understand blanking off or joining the water pipes but what do you do about the oil cooler side?

Sprint Car Head Gasket???

Posted: Thu Aug 15, 2019 4:05 pm
by Dcrosby13
good luck with that, those hoses are about the most difficult bit to get to although your inlet manifold is different than mine