Need Advice
Thread Starter
Instructor
Joined: Jul 2020
Posts: 219
Likes: 49
From: APACHE JUNCTION AZ
Need Advice
Hi All
I am going to be building a ls 416 for my 2000 Vette. It will only be used on the street. Do you think I should go with 11.4/1 or 12.5/1 CR. I am looking for around 500 RWHP give or take some. This is my first ls build and not sure which CR to shoot for.
Thanks
Mike
I am going to be building a ls 416 for my 2000 Vette. It will only be used on the street. Do you think I should go with 11.4/1 or 12.5/1 CR. I am looking for around 500 RWHP give or take some. This is my first ls build and not sure which CR to shoot for.
Thanks
Mike
Drifting
Joined: May 2007
Posts: 1,547
Likes: 210
From: Huntersville, NC
concerns
My advice is to select the tuner first, and see what his ideas to meet your goals are. Upgrades are $50per HP, so your 500 hp goal will cost you $7500. from stock.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
I share his concerns, to get to 500 means cam selection is important. The pistons chases the exh valve up, so PTV distance is very important when you go to milling heads to increase CR. With stock heads and stock cam PTV is about 1/8”. You may get nowhere, as you may have to give up performance offered by cam design, if CR is out front in your design.
My advice is to select the tuner first, and see what his ideas to meet your goals are. Upgrades are $50per HP, so your 500 hp goal will cost you $7500. from stock.
My advice is to select the tuner first, and see what his ideas to meet your goals are. Upgrades are $50per HP, so your 500 hp goal will cost you $7500. from stock.
Thread Starter
Instructor
Joined: Jul 2020
Posts: 219
Likes: 49
From: APACHE JUNCTION AZ
Hi
Thanks for the info. I think the DCR is going to be 8.40:1. Cam Spect are
Cam Valve Events.050".050"
Intake Duration232Intake Valve opens4BTDC (- indicates ATDC)
Exhaust Duration240Intake Valve closes48ABDC
Lobe Separation Angle114Exhaust Valve Opens56BBDC
Intake Centerline112Exhaust Valve Closes4ATDC (- indicates BTDC)
Exhaust Centerline116
Overlap 8degree
If I don't make the 500 RWH it is no big deal. It is more or less wishful thinking.
Thanks for the info. I think the DCR is going to be 8.40:1. Cam Spect are
Cam Valve Events.050".050"
Intake Duration232Intake Valve opens4BTDC (- indicates ATDC)
Exhaust Duration240Intake Valve closes48ABDC
Lobe Separation Angle114Exhaust Valve Opens56BBDC
Intake Centerline112Exhaust Valve Closes4ATDC (- indicates BTDC)
Exhaust Centerline116
Overlap 8degree
If I don't make the 500 RWH it is no big deal. It is more or less wishful thinking.
Le Mans Master
Joined: Aug 2005
Posts: 5,375
Likes: 328
From: CA.
St. Jude Donor '13-'14-'15
Depends where you live and your access to good premium fuel
Here in calif we only have 91 oct premium fuel and even that sucks !!!
I have several Corvettes and several old school muscle cars--At best our premium is only good for about 10.5--to 10.75 compression ration otherwise it detonates badly and I have to remove 4-6 * of timing in the tune to prevent it -That takes away HP and TQ and kills off the bottom end
Even if you live in a state that has better 93 oct fuel I would still never go above around 11.0 to 11.5---
Otherwise you will have to detune the timing or it will melt off spark plugs tips with detonation
OR run race fuel or E85----Race fuel todays is about $12 per gallon---Your call
PS On the newer DI C7/C8 Corvettes yes GM raised the compression to about 11.5---But that is strictly a result of direct injection using even cheap Calif 91 oct fuel
Here in calif we only have 91 oct premium fuel and even that sucks !!!
I have several Corvettes and several old school muscle cars--At best our premium is only good for about 10.5--to 10.75 compression ration otherwise it detonates badly and I have to remove 4-6 * of timing in the tune to prevent it -That takes away HP and TQ and kills off the bottom end
Even if you live in a state that has better 93 oct fuel I would still never go above around 11.0 to 11.5---
Otherwise you will have to detune the timing or it will melt off spark plugs tips with detonation
OR run race fuel or E85----Race fuel todays is about $12 per gallon---Your call
PS On the newer DI C7/C8 Corvettes yes GM raised the compression to about 11.5---But that is strictly a result of direct injection using even cheap Calif 91 oct fuel
Thread Starter
Instructor
Joined: Jul 2020
Posts: 219
Likes: 49
From: APACHE JUNCTION AZ
Hi
Thank you for the reply. I live in AZ and the gas here is not the best. I will be going with 11.5 to 1, I think that will be the best for my usage.
Thanks again to all who added their knowledge
Mike
Thank you for the reply. I live in AZ and the gas here is not the best. I will be going with 11.5 to 1, I think that will be the best for my usage.
Thanks again to all who added their knowledge
Mike
Racer
Joined: Apr 2021
Posts: 289
Likes: 102
From: Texas
Consider giving someone like this a call to chat about stroker and hitting your number. I can't claim to be a super expert, but 500hp with a 416 should be fairly easy, I managed to hit that with a 383 stroker and great heads along with cam, and I stayed lower at about 10.5 to 1 ratio.
https://www.lsxperformanceparts.com....-900-hp-rated/
I mean that's 6.8 liters, lots of torque for sure, which you will really love, so even if you were low (which I find hard to believe) you might not even notice driving around town. And a cam just gets swallowed up with those nice larger block setups. A 227/236 .600/.600 lift on a 112LS would seem like a baby cam for example (I'd probably go more aggressive myself, but it just depends where you want the power for street driving and your rear gears).
https://www.lsxperformanceparts.com....-900-hp-rated/
I mean that's 6.8 liters, lots of torque for sure, which you will really love, so even if you were low (which I find hard to believe) you might not even notice driving around town. And a cam just gets swallowed up with those nice larger block setups. A 227/236 .600/.600 lift on a 112LS would seem like a baby cam for example (I'd probably go more aggressive myself, but it just depends where you want the power for street driving and your rear gears).
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Thread Starter
Instructor
Joined: Jul 2020
Posts: 219
Likes: 49
From: APACHE JUNCTION AZ
Hi
This engine will most likely never see over 6,700 RPM. I am looking for power in the lower and midrange. It is going into a really nice 2000 conv. My buddy who is doing the body and paint is doing such a great job I want to build a strong good looking street motor with enough power to hold it's own on the street.
I went to PatG for the cam specs for a engine to make great low and midrange power.
Have most of the parts purchased. Block will soon be at the machine shop.
This engine will most likely never see over 6,700 RPM. I am looking for power in the lower and midrange. It is going into a really nice 2000 conv. My buddy who is doing the body and paint is doing such a great job I want to build a strong good looking street motor with enough power to hold it's own on the street.
I went to PatG for the cam specs for a engine to make great low and midrange power.
Have most of the parts purchased. Block will soon be at the machine shop.
Race Director
Joined: Oct 2004
Posts: 12,864
Likes: 4,667
If I can make a cam recommendation, I'd say call Allan Futral at Futral Motorsports. The most important decision to make when shopping for a cam is being honest with yourself about how you'll use your car. Then give the cam grinder that same honest view of how you'll use your car. IMHO, I'd try to stay at .600"-.610" lift for longevity, with maybe a 230°/240° duration intake and exhaust, on a 112° LSA. Some of this decision will depend on whether you have an A4 trans, or the manual 6 speed. But, go with what Allan, or with whatever cam grinder you choose, says......
Last edited by grinder11; May 3, 2021 at 11:02 AM.