difference in hp?
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From: LONG ISLAND , NY
Car: 86 T/A
Engine: 2000 TPI 5.7L vortec L31
Transmission: 700R4
difference in hp?
Hey guys,
I know ive asked this question before, but I never got a clear answer. How much difference in HP. would a 350 engine with a cam w/ 220 to 230 dur. and .495 Int. and .495 Exh. make over the same identical 350 with a cam w/ 210 to 220 dur. and .480 Int. and .480 Exh.? Both Hyd. roller and both durations @ 50 and LSA is at 112. TPI engines with the same size Headers and heads and so on and so on.
Thanks,
I know ive asked this question before, but I never got a clear answer. How much difference in HP. would a 350 engine with a cam w/ 220 to 230 dur. and .495 Int. and .495 Exh. make over the same identical 350 with a cam w/ 210 to 220 dur. and .480 Int. and .480 Exh.? Both Hyd. roller and both durations @ 50 and LSA is at 112. TPI engines with the same size Headers and heads and so on and so on.
Thanks,
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From: Springfield, MO
Car: 92 T/A VERT
Engine: LB9
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A little of that may depend on what kind of heads the engine has, but with tpi your probably not going to gain much with an intake duration above 210 degrees.
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From: Cypress, California
Car: 1989 GTA
Engine: 369 TPI
Transmission: 4L60E
Axle/Gears: 3.70 Nine Bolt
I looked into this with my current setup on Desktop Dyno. The difference was maybe 10-15HP. My current setup has a 212 degree cam and I was looking at the 218, 220, 224 and 230 degree cams.
I would have had to go to the 224 degree cam to get the 10-15HP difference. Not worth it for me. My 212 degree cam has a nice idle and plenty of vacuum to run everything. Allen
I would have had to go to the 224 degree cam to get the 10-15HP difference. Not worth it for me. My 212 degree cam has a nice idle and plenty of vacuum to run everything. Allen
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Good posts
Both of the other guys that replied to this gave great responses. Here's my 2 cents.
Sometimes people make blanket statements like "it sucks" or "it's bad."
As an engineer, I look at many things differently than many people. Be that good or bad, I like to ask the question, “what exactly are you looking for?” Everyone’s expectations are different. Let’s take a 350 for example. If you are shopping for 300HP a TPI will easily accommodate that and have great low end, mileage, manners, etc. If you’re looking for 350HP TPI will do fine also IF you have the right component match. If you’re shopping for 400HP a shorter runner system would do better.
I’m amazed at the lack of the total system perspective out there. For example, a good set of SB heads flow up to about 225 cfm at peak lift on the intake port in many setups see; this is inline with the TPI system. If you need more flow modified or aftermarket runners will do the trick. But can your heads handle it? In most cases the answer is no, regardless of valve timing (bigger cams no longer help).
Sometimes people make blanket statements like "it sucks" or "it's bad."
As an engineer, I look at many things differently than many people. Be that good or bad, I like to ask the question, “what exactly are you looking for?” Everyone’s expectations are different. Let’s take a 350 for example. If you are shopping for 300HP a TPI will easily accommodate that and have great low end, mileage, manners, etc. If you’re looking for 350HP TPI will do fine also IF you have the right component match. If you’re shopping for 400HP a shorter runner system would do better.
I’m amazed at the lack of the total system perspective out there. For example, a good set of SB heads flow up to about 225 cfm at peak lift on the intake port in many setups see; this is inline with the TPI system. If you need more flow modified or aftermarket runners will do the trick. But can your heads handle it? In most cases the answer is no, regardless of valve timing (bigger cams no longer help).
Thread Starter
Member
Joined: Jan 2004
Posts: 328
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From: LONG ISLAND , NY
Car: 86 T/A
Engine: 2000 TPI 5.7L vortec L31
Transmission: 700R4
Re: Good posts
Originally posted by brianp454
Both of the other guys that replied to this gave great responses. Here's my 2 cents.
Sometimes people make blanket statements like "it sucks" or "it's bad."
As an engineer, I look at many things differently than many people. Be that good or bad, I like to ask the question, “what exactly are you looking for?” Everyone’s expectations are different. Let’s take a 350 for example. If you are shopping for 300HP a TPI will easily accommodate that and have great low end, mileage, manners, etc. If you’re looking for 350HP TPI will do fine also IF you have the right component match. If you’re shopping for 400HP a shorter runner system would do better.
I’m amazed at the lack of the total system perspective out there. For example, a good set of SB heads flow up to about 225 cfm at peak lift on the intake port in many setups see; this is inline with the TPI system. If you need more flow modified or aftermarket runners will do the trick. But can your heads handle it? In most cases the answer is no, regardless of valve timing (bigger cams no longer help).
Both of the other guys that replied to this gave great responses. Here's my 2 cents.
Sometimes people make blanket statements like "it sucks" or "it's bad."
As an engineer, I look at many things differently than many people. Be that good or bad, I like to ask the question, “what exactly are you looking for?” Everyone’s expectations are different. Let’s take a 350 for example. If you are shopping for 300HP a TPI will easily accommodate that and have great low end, mileage, manners, etc. If you’re looking for 350HP TPI will do fine also IF you have the right component match. If you’re shopping for 400HP a shorter runner system would do better.
I’m amazed at the lack of the total system perspective out there. For example, a good set of SB heads flow up to about 225 cfm at peak lift on the intake port in many setups see; this is inline with the TPI system. If you need more flow modified or aftermarket runners will do the trick. But can your heads handle it? In most cases the answer is no, regardless of valve timing (bigger cams no longer help).
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