Re: What do u guys run for cranking compression
[Re: rook440]
#2456282
02/23/18 07:23 PM
02/23/18 07:23 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Mines at 160 would like to see it up around 200...whats your opinions..thanks rook What's the application/purpose of the motor? ?? this is in my drag car..a 2700 lb 68 charger..i use race gas...and this question is not a hoax...lol Ok, got you.. For pump gas 175 would be about the max, but since you use race gas, well over 200 if your octane is high enough. The BIIIG problem with your car is that your cam is WAAAY to big for your comp. People have been saying that All along but you didn't seem to be listening, hence my hoax statement. Change your cam to around a 260-265 max on a 108 LSA max and you will get your higher cranking comp and performance. Id also install it around 102/104 ICL as well. Id personally wouldn't go any higher the the 260 @ .050 Do that and I think you will be happy. No hoax here either.
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Re: What do u guys run for cranking compression
[Re: Thumperdart]
#2456353
02/23/18 10:23 PM
02/23/18 10:23 PM
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Joined: Jan 2003
Posts: 6,591 Canton, Ohio
Sport440
master
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master
Joined: Jan 2003
Posts: 6,591
Canton, Ohio
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Ask Mikeys Mopar on here about his "too big" cam and only 11.7.1 comp. and his 9.50 et's............. Yeah, but not really a apples to apples comparison. Bigger heads, roller cam, etc, vs old 67 ported heads flat tappet. He also had troubles with his 60 ft. Wonder why?? That may be fixed by now, but remember he started with 1.44 60,s then got down to 1.355, last I saw. A 9.50 60 ft should be around a 1.31, don't know where hes at now, but these two cars shouldn't be compared on Just the comp alone.
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Re: What do u guys run for cranking compression
[Re: rook440]
#2456555
02/24/18 08:26 AM
02/24/18 08:26 AM
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Joined: Aug 2003
Posts: 1,313 Charlotte, NC
LSP
pro stock
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pro stock
Joined: Aug 2003
Posts: 1,313
Charlotte, NC
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Back in the day, built a 440-6 with unported 906 heads, weiand intake, 11-1, shift @ 7100, 289°/289°@.050" cam, ran 10-teens @ 3500 lbs..
Point is that a motor's need for air can outweigh a percieved optimum cranking compression, or a percieved optimum dynamic compression figure.
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Re: What do u guys run for cranking compression
[Re: rook440]
#2456925
02/24/18 08:44 PM
02/24/18 08:44 PM
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Joined: Aug 2003
Posts: 43,202 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,202
Bend,OR USA
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Mines at 160 would like to see it up around 200...whats your opinions..thanks rook Why do you want that cranking compression reading? Have you tested your motor cold and then again when hot? If not do that now Then add a little shot of oil into the worst cylinders and see if their readings goes up or not, if not, find out why I use a leak down meter to test cylinder conditions on the ring seal and valve sealing The time slips and spark plug readings tells me if the car is slowing down or not
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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