Joined
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178 Posts
The Engine:
466, c8 heads (mild porting), dual plane stealth w/ 2" spacer, 850 demon (4150), Holley Blue electric pump (-8 lines no return), MSD dizzy, 6al box, AR 32 plugs (68 heads limit spark plug options), 40 deg timing. That should get us started......
The Truck:
1979 F350 4x4, 4 sp, single disc ram clutch (sintered iron), 4.10 gears, used for truck pulling.
The issue:
Falling on its face under load! Only happens briefly and then she comes to life very good. From Idel to WOT without any load I do not notice any lagging at all. I was working with it to day and took it out in a wide open field and just let it idel in 2nd gear, smashed it to WOT and it has a noticable lag. When I hook to the sled, bring the RPMS up to around 5000, start releasing the clutch it just continues to fall way down to the point that you will think it is going to die and then it gradually starts to come back to life.
I was blaming this on my driving technique (not bringing the R's up enough) and the clutch engagement (very aggressive) until I tested it in the field without being hooked to anything. Here is a link to one of my pulls: You will hear the engine lag way down.
http://www.youtube.com/watch?v=pPWtR2o9J78
Any thoughts of what I should check first?
466, c8 heads (mild porting), dual plane stealth w/ 2" spacer, 850 demon (4150), Holley Blue electric pump (-8 lines no return), MSD dizzy, 6al box, AR 32 plugs (68 heads limit spark plug options), 40 deg timing. That should get us started......
The Truck:
1979 F350 4x4, 4 sp, single disc ram clutch (sintered iron), 4.10 gears, used for truck pulling.
The issue:
Falling on its face under load! Only happens briefly and then she comes to life very good. From Idel to WOT without any load I do not notice any lagging at all. I was working with it to day and took it out in a wide open field and just let it idel in 2nd gear, smashed it to WOT and it has a noticable lag. When I hook to the sled, bring the RPMS up to around 5000, start releasing the clutch it just continues to fall way down to the point that you will think it is going to die and then it gradually starts to come back to life.
I was blaming this on my driving technique (not bringing the R's up enough) and the clutch engagement (very aggressive) until I tested it in the field without being hooked to anything. Here is a link to one of my pulls: You will hear the engine lag way down.
http://www.youtube.com/watch?v=pPWtR2o9J78
Any thoughts of what I should check first?