I'm having trouble sorting out a couple of things in my GT40 motor, which I'm starting to thing are related. I use my 40 for sprints and hillclimbs. Only three events this year due to trans issues. Not fun.
Anyways, just completed a circuit sprint on the weekend and it seems there is a pattern forming.
1) Motor has oil surge. Always has. It's a 347, with a Boss 302 block and Edelbrock Victor Jr. heads. I've had to fit an accusump to keep motor alive. Presently it has a Milodon road race baffled sump (oil pan) and windage tray. It don't hold oil pressure past about 0.9 g cornering, whereas with some slight suspension tweaks the car is now getting up to 1.1 g consistently and spiking up to 1.3 g on turn in if I'm brave.
2) The other half of the problem I'm having is that the motor misfires coming out of corners, coughs and then clears and pulls happily down the straight. Doesn't happen every corner, but does tend to get worse as the day goes on. Search youtube 200MPH GT40 and you'll see and hear what I'm talking about.
What I'm starting to think is that the oil is getting in to combustion chambers and oiling up the plugs when in the corners. I'm running NGK 6 heat range plugs, whereas I think 7 heat range (colder) should be more suited given the power output (386 RWHP).
Does anyone have any specifice experience in this area they can share?
My next plan is to try a Canton Cobra 302 road-race sump, as the baffling in those is different (diamond design), plus it incorporates an anti-slosh baffle and a crank scraper. Yes, I'd like to go dry sump, but it chews up a lot of room, money, time and adds several levels of complexity I'd rather do without if I could. But I understand a properly setup dry sump system is the ultimate answer. I just can't see why a decent wet sump can't do the job, given that I'm not cornering that hard yet in racing terms. Now if/when I can get it to corner consistenly at 1.3 g and spike up to say 1.5 g, well, then I'd understand, and be very happy too!
Any thoughts on my theory as to why it's missfiring, my next planned sump or am I going completely off track here?
Thanks,
Julian
Anyways, just completed a circuit sprint on the weekend and it seems there is a pattern forming.
1) Motor has oil surge. Always has. It's a 347, with a Boss 302 block and Edelbrock Victor Jr. heads. I've had to fit an accusump to keep motor alive. Presently it has a Milodon road race baffled sump (oil pan) and windage tray. It don't hold oil pressure past about 0.9 g cornering, whereas with some slight suspension tweaks the car is now getting up to 1.1 g consistently and spiking up to 1.3 g on turn in if I'm brave.
2) The other half of the problem I'm having is that the motor misfires coming out of corners, coughs and then clears and pulls happily down the straight. Doesn't happen every corner, but does tend to get worse as the day goes on. Search youtube 200MPH GT40 and you'll see and hear what I'm talking about.
What I'm starting to think is that the oil is getting in to combustion chambers and oiling up the plugs when in the corners. I'm running NGK 6 heat range plugs, whereas I think 7 heat range (colder) should be more suited given the power output (386 RWHP).
Does anyone have any specifice experience in this area they can share?
My next plan is to try a Canton Cobra 302 road-race sump, as the baffling in those is different (diamond design), plus it incorporates an anti-slosh baffle and a crank scraper. Yes, I'd like to go dry sump, but it chews up a lot of room, money, time and adds several levels of complexity I'd rather do without if I could. But I understand a properly setup dry sump system is the ultimate answer. I just can't see why a decent wet sump can't do the job, given that I'm not cornering that hard yet in racing terms. Now if/when I can get it to corner consistenly at 1.3 g and spike up to say 1.5 g, well, then I'd understand, and be very happy too!
Any thoughts on my theory as to why it's missfiring, my next planned sump or am I going completely off track here?
Thanks,
Julian