is this dcr or scr ?
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From: Houston/The Woodlands
i called him friday, he was leaving shop. and was going to be out of town till wedness day. so i am calling tomorrow and going to try and get all of the specs. i'm really just worried about my hp. i really wanted to make 450 to the ground.
Well you have some good heads. I would see about disassembling and putting in some smaller dish pistons to bring the CR back up. If it's not in the car yet, I would bite the bullet and fix it. Dig up the CC on your current pistons and then get back to us here.
I just saw this. The springs I am pretty sure are not going to be enough 125lbs on the seat is pretty damned low, if they do work then those are some mightly lazy lobes. Not that lift makes power but still I would say lift is low too, you will find that probaly most heads/cam cars run more lift and spring.
Compression as has been said stock was 10.4, hell the iron head LT1 in the Impala was 10.0 and ran on 87octane per GM specs.
I am running 11.5:1 on my stock shortblock with milled aluminum heads and a thin gasket. Guys with built LT1s are known to go over 12:1 on pump gas for the street with tthe right cam.
I sincerly hope you missunderstood the builder or he read the wrong build sheet or something because if everything you told us sofar is right I think you will endup shy of 480 at the flywheels much less the rear wheels.
Compression as has been said stock was 10.4, hell the iron head LT1 in the Impala was 10.0 and ran on 87octane per GM specs.
I am running 11.5:1 on my stock shortblock with milled aluminum heads and a thin gasket. Guys with built LT1s are known to go over 12:1 on pump gas for the street with tthe right cam.
I sincerly hope you missunderstood the builder or he read the wrong build sheet or something because if everything you told us sofar is right I think you will endup shy of 480 at the flywheels much less the rear wheels.
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ok here is SOME info he couldnt get me all of it because yet again it is on a paper that he has to find. because all of the block work was done about 6 months ago (this has been a long project).
piston clearance = .004
ring gap = 18
head cc = 67
bore = 4.030
stroke = 3.75
rocker ratio = 1.5
< I WILL BE CHANGING THIS TO 1.6 FOR SURE!!
head degree = 23*
rod length = 6" (eagle H beam)
bearing clearance = .002
yeah i know that is not all of the information need to get the compress i know i still need the piston cc. but i am just trying to get all the information about this motor i can. so again i will call him monday and try to get the rest. he is also a older man, so i think he is forgetful.
missing
piston ring height = ?
deck height = ?
piston cc = ?
any thing else i am missing?
piston clearance = .004
ring gap = 18
head cc = 67
bore = 4.030
stroke = 3.75
rocker ratio = 1.5
< I WILL BE CHANGING THIS TO 1.6 FOR SURE!!head degree = 23*
rod length = 6" (eagle H beam)
bearing clearance = .002
yeah i know that is not all of the information need to get the compress i know i still need the piston cc. but i am just trying to get all the information about this motor i can. so again i will call him monday and try to get the rest. he is also a older man, so i think he is forgetful.
missing
piston ring height = ?
deck height = ?
piston cc = ?
any thing else i am missing?
You may have to ask him which piston clearance he's talking about. Could be piston-to-wall or piston-to-deck. All of the JE ultralite pistons on Summit have 2cc valve reliefs. Also need to know what head gaskets you're using. If you use the felpros and assume .004 deck height, you get 11:1 SCR. Need the advertised durations, LSA and ICL to find DCR.
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ok i will ask him witch clearance he is talkin about. yes i remember that we did use felpros. i can get the advertised duration from my father. he has a card from comp cam with all of the specs on the cam.
I can get the info from the card and post it up tomorrow.
but here are the specs i know about the cam 516/522 230* 240* @.050 112lsa
I can get the info from the card and post it up tomorrow.
but here are the specs i know about the cam 516/522 230* 240* @.050 112lsa
Originally Posted by seawolf06
The @.050" numbers are only used to compare cams, not calculate DCR. Looks like a custom cam, but I don't know why they went a little low on the lift.
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It could be a worthwhile motor. SCR being low will be safe and reliable, even if you get a bad batch of gas. The cam looks decent and will work with some cheaper springs like the crane kit. Should be a good around town driver. Just what everyone else says is optimum may not be right for what you want. Do it and if you like it, that's all that matters. Good Luck!
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what do you guys think about this cam. I WILL be using 1.6 RR, even though the cam was rated with 1.5's on the paper. Is there a better cam you might sudgest? since the motor is not in the car now would be a good time to put the RIGHT cam in it.
i figured the advertised duration should be on this paper... maybe the .344 & .348?
Kenneth HI Performance is the guy that built it
The engine was built to be a DD and it is also my only car. so i told the builder that it had to be a reliable motor. Also it would need to be able to drive from houston to San Antonio (about 2 and 1/2 or 3 hours) if needed to. And i would also like around 450 to the ground. Now i know that 450 to the ground and a DD car is a hard combination. but he told me that he could do it so i believed him. now i am unsure
i figured the advertised duration should be on this paper... maybe the .344 & .348?
Kenneth HI Performance is the guy that built it
The engine was built to be a DD and it is also my only car. so i told the builder that it had to be a reliable motor. Also it would need to be able to drive from houston to San Antonio (about 2 and 1/2 or 3 hours) if needed to. And i would also like around 450 to the ground. Now i know that 450 to the ground and a DD car is a hard combination. but he told me that he could do it so i believed him. now i am unsure
Last edited by 96redcamaro; Jan 22, 2007 at 01:59 PM.
450 is going to be really difficult NA. None of those numbers listed are the advertised numbers. The ones you listed are the lobe lift. Just multiply that number by the rocker arm ratio and you get your valve lift. I'm not saying that's a bad cam, but you should ask what the advertised durations are at .006".
Lift with 1.6s will be like .550/.557, that is pretty close too what I run but my cam has less duration in a street car but I have beehive 918s setup too more like 140 on the seat.
IMO the guy went too wild on the heads and too conservative on the cam and compression.
The duration of the cam could make for a nice reasonably mild stroker daily driver, just thing you need some more lift and easily another .5 compression increase.
1.7 rockers would push it up into the .59x range which might be a bit much. Think Harland Sharp offers 1.65 which would be more like .57x, with the right springs that might be a good compromise.
IMO the guy went too wild on the heads and too conservative on the cam and compression.
The duration of the cam could make for a nice reasonably mild stroker daily driver, just thing you need some more lift and easily another .5 compression increase.
1.7 rockers would push it up into the .59x range which might be a bit much. Think Harland Sharp offers 1.65 which would be more like .57x, with the right springs that might be a good compromise.
I am sure they do but personally I do not know if I would be comfortable with .600 on a true daily driver. I could be wrong there but with the right cam I do not think using max lift is all important, get most heads up into the .550 range and they flow near peak, go a bit past there so you have a decent amount of time spent in that good flow range. Go over .600 lift and I worry about valvetrain longevity in a driver, for the track sure.