Hi everyone.
I have a friend with a 1986 Camaro with a L98 350, 700R4 trans and 2400 B&M Converter. Engine was bored .030 over with factory CC spec pistons Has Edelbrock performer heads 350-60859 60cc and a TPIS mini ram intake and Lingenfelter Cam Shaft: part number 74219 (219/219 .525/.525 112deg).
He has had an issue with the car for the last couple years but got fed up with it and has kinda pushed it aside. I went for a ride in it a week ago and idling down the road the car does 25-30 mph. It feels like as soon as you put it in gear it wants to drive. We were able to verify that the lockup converter is locking up while driving down the road and it unlocks if you hit the brakes while crusing. So at this point I feel safe that the converter lockup is not the issue. Could it be that the coverter is too small? Short block was supposed to be built to stock CR but with the 60cc heads I would think he has got to be pushing 9.5-10:1 cr.
I am going to be posting on TGO a datalog from driving around the neighborhood to help figure out an issue with the idle quality. Engine runs very rough but with the stock narrow band it is hard to see where the AF ratio is. I know its richer than stoich but plugs aren't showing anything crazy rich. Maybe the issue with the engine idling/running is also causing the driving issue?
Would you want a larger converter or do you feel there are other issues elsewhere that could be causing the issue?
The vacuum at idle is about 16" which I feel is a little too low but it is steady.
Thanks
Shane
I have a friend with a 1986 Camaro with a L98 350, 700R4 trans and 2400 B&M Converter. Engine was bored .030 over with factory CC spec pistons Has Edelbrock performer heads 350-60859 60cc and a TPIS mini ram intake and Lingenfelter Cam Shaft: part number 74219 (219/219 .525/.525 112deg).
He has had an issue with the car for the last couple years but got fed up with it and has kinda pushed it aside. I went for a ride in it a week ago and idling down the road the car does 25-30 mph. It feels like as soon as you put it in gear it wants to drive. We were able to verify that the lockup converter is locking up while driving down the road and it unlocks if you hit the brakes while crusing. So at this point I feel safe that the converter lockup is not the issue. Could it be that the coverter is too small? Short block was supposed to be built to stock CR but with the 60cc heads I would think he has got to be pushing 9.5-10:1 cr.
I am going to be posting on TGO a datalog from driving around the neighborhood to help figure out an issue with the idle quality. Engine runs very rough but with the stock narrow band it is hard to see where the AF ratio is. I know its richer than stoich but plugs aren't showing anything crazy rich. Maybe the issue with the engine idling/running is also causing the driving issue?
Would you want a larger converter or do you feel there are other issues elsewhere that could be causing the issue?
The vacuum at idle is about 16" which I feel is a little too low but it is steady.
Thanks
Shane