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Timing on a blower engine
We have a 493 ci with an 8/71 blower and I don't know what timing to use.
At 12 deg. at idle the hedders will glow, so I think we should have a locked timing at 32 deg. We only put out 10 psi of charge, it's for street/strip so we won't maximise the combo when we will use it 90% of the time on the street. Thanks. Joakim |
#2
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in reply
bring the timing down to 29deg total and give it more fuel.
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If your timing is retarded the headers will glow. I have my distributor locked so there is no advance. I have mine set at 32 degrees and run 12 lbs. boost on race gas. On the dyno it picked up 38 HP more at 32 degrees than at 30. I would have liked to try 34 degrees but didn't. Dyno operator said 852 HP @ 6500 was already pushing the limit of a stock block-so I quit at that.
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Timing
OK, the timing is locked at 30 deg. and we gave it more fuel and it is a killer on the street.
But we only charge 3psi but we will put more boost on it later, we will charge 10 psi when it's optimized. Remember it's just a 493ci Eddy headed littlefield(with stripes)8/71 street engine. Now we have a problem with the converter locking to late, it's an A1 with 3800 stall and I told the guy(owner of the car) that he should use a lower (2500) stall converter, but after putting in $15.000 in the engine he had no money left. Thanks for your help. Joakim |
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Mr.Sixpack, your set up sounds similar to mine.(Eddy heads) I am running a 3200 stall converter for my application built by Coan of Indiana.
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AJ
Do you have any problems with that amount of stallspeed, we have problems that when the converter hooks up we go up in smoke.
I know that it's a bit cold now but it's scary. AJ what do you think the power is in our combo?? I used "Dragstrip Plus" and with 10 psi of boost we got 867 hp in the engine and 700 somthing on the rearwheels Thanks. Joakim |
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Mr.Sixpack, I don't have any trouble-but I have 33.5 X 15 Goodyears and 4.30 gears, and I come off the line at 2400 RPM's. I just switched to 3.89 gears so I won't over-rev in the quarter. With the 4.30's I would come across the line at 7000-7100 RPM's. (I haven't tried the 3.89's out yet-hopefully this weekend, if the rain stays away)
As far as your power output-I don't know what you have done to the motor, besides the Eddy heads. (Do you have any extra work done to the heads? I had mine ported for blower use and 1.88 exhaust valves installed) |
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