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Which way to move the cam to reduce cylinder pressure?
#971244
04/11/11 04:29 PM
04/11/11 04:29 PM
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Joined: Feb 2003
Posts: 265 Garland, Texas
1badmopar
OP
enthusiast
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OP
enthusiast
Joined: Feb 2003
Posts: 265
Garland, Texas
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I would like to pull some clyinder pressure out of my motor at idle. I am not sure if I need to advance the cam or retard it.
I think retarding the cam will reduce the pressure at idle and move the powerband up in the rpm range. Can someone please confirm?
I am thinking about a 2 degree change. Thoughts? Too much, too little?
Thanks,
1966 Plymouth Belvedere 520" RB w/ Indy 440-1 Heads FiTech Fuel Injection TKO 600 conversion [img] https://flic.kr/p/2j1ejsK[/img]
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Re: Which way to move the cam to reduce cylinder pressure?
[Re: Pacnorthcuda]
#971247
04/11/11 05:06 PM
04/11/11 05:06 PM
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Joined: Feb 2003
Posts: 265 Garland, Texas
1badmopar
OP
enthusiast
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OP
enthusiast
Joined: Feb 2003
Posts: 265
Garland, Texas
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Thanks for the replies! It is on my 520" RB. I am having severe dieseling issues at shut down. I have tried two different carbs and the same symptom exists. It seems to have a tremendous amount of cylinder pressure at low rpm, so I am going to back it off a little and see what happens.
The motor made peak power at 5400 rpm, so I can stand to move the power band up a little. It made 708 ft lbs at 4500, so I am not worried about loosing a little bottom end. Especially with the low 1st gear in the TKO.
Thanks!
1966 Plymouth Belvedere 520" RB w/ Indy 440-1 Heads FiTech Fuel Injection TKO 600 conversion [img] https://flic.kr/p/2j1ejsK[/img]
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Re: Which way to move the cam to reduce cylinder pressure?
[Re: 1badmopar]
#971248
04/11/11 05:12 PM
04/11/11 05:12 PM
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Joined: Jan 2003
Posts: 74,909 U.S.S.A.
JohnRR
I Win
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I Win
Joined: Jan 2003
Posts: 74,909
U.S.S.A.
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Quote:
Thanks for the replies! It is on my 520" RB. I am having severe dieseling issues at shut down. I have tried two different carbs and the same symptom exists. It seems to have a tremendous amount of cylinder pressure at low rpm, so I am going to back it off a little and see what happens.
The motor made peak power at 5400 rpm, so I can stand to move the power band up a little. It made 708 ft lbs at 4500, so I am not worried about loosing a little bottom end. Especially with the low 1st gear in the TKO.
Thanks!
Dieseling is usually caused by the throttle butterflies being open to much at idle .
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