Posted By: Bratt Racing
Any idea what would cause the Valley Plate to have a bu - 07/15/14 04:01 PM
Does anyone have any idea what would cause the Valley Plate to have a bubble or hump in it? I noticed it after we ran last round at Night Under Fire at Trails. The car runs fine. Last evening I went through the test of checking the compression, presser in the radiator, if any water spit out of the plug holes and if the damper may have been plugged up. At first I thought I might have blown a head gasket but everything checked out ok. Tonight I am going to pull the manifold off. Looking for ideas I am a little baffled now.
Posted By: Al_Alguire
Re: Any idea what would cause the Valley Plate to have a bu - 07/15/14 04:59 PM
To much pressure in the crankcase.
Posted By: Sport440
Re: Any idea what would cause the Valley Plate to have a bu - 07/15/14 05:06 PM
Yes, to much pressure in the crankcase. Hopefully your breather is clogged. If not suspect a cracked piston or broken rings.
I wouldnt race it again, without checking the above.
Posted By: Sport440
Re: Any idea what would cause the Valley Plate to have a bu - 07/16/14 02:16 AM
Absolutely not.
Causes.
Plugged breather valve
Excessive ring blowby.
Blown head gasket passing gasses into crankcase.
Cracked piston.
Only X amount of ways to pressurize the crankcase.
Posted By: Bratt Racing
Re: Any idea what would cause the Valley Plate to have a bu - 07/16/14 02:22 AM
Thanks guys for your help. Think we might have just found it. the check value for the evac to the exhaust looks like it is bad. I am going to purchase a new kit tonight and the header gaskets.
My grandson has been helping me and learning at the same time. This is a new motor with only about 20 pass on it.
Posted By: a493demon
Re: Any idea what would cause the Valley Plate to have a bu - 07/16/14 02:37 AM
i would go though about 2 or 3 check valve's a year.
just start it and see if it's blowing up the hose into the valve cover .
Posted By: RapidusMaximus
Re: Any idea what would cause the Valley Plate to have a bu - 07/16/14 03:41 AM
When I switched to Flying Toilet alky fuel injection I had to put a vacuum pump on to cure that issue, pan evac that I had used for years was no longer effective. I was bulging a tin valley pan every weekend.
Posted By: 69dart
Re: Any idea what would cause the Valley Plate to have a bu - 07/17/14 02:04 AM
The only time I had a valley pan do that was when I tried some collector insert mufflers and it made a ton of exhaust back pressure.