How many centri guys run lots of overlap and centerlines under 114?
02-07-2008, 03:39 PM
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How many centri guys run lots of overlap and centerlines under 114? Just testing theories here-I would like to see what the hi-horsepower guys are using? I keep hearing everyone talk about 114-116 centerlines, low overlap, low compression motor build ups.
02-07-2008, 04:43 PM
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Might be worth asking down under, some of them seem to favour such cams..
The 2nd cam I ever tried, was a 230/236 on 112 Thunder profile on my 346, stg 1 ported 853 castings YSi at about 15psi.
It did perform ok. Think I was running about 11.5 at 132mph at the time. I hated how it idled though. Although there may have been other contributing factors.
The wide LSA's just help the idle IMO, and for me, that is important.
The 2nd cam I ever tried, was a 230/236 on 112 Thunder profile on my 346, stg 1 ported 853 castings YSi at about 15psi.
It did perform ok. Think I was running about 11.5 at 132mph at the time. I hated how it idled though. Although there may have been other contributing factors.
The wide LSA's just help the idle IMO, and for me, that is important.
02-07-2008, 04:49 PM
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https://ls1tech.com/forums/forced-induction/483164-new-408-dyno-queen-950hp-12psi.html
Although the pics seem to be dead now.
I think the car with that engine ran like 8.62 at 164mph or something, circa 3-3200lbs ?
Drag Ute, with BIG tyres.
Although the pics seem to be dead now.
I think the car with that engine ran like 8.62 at 164mph or something, circa 3-3200lbs ?
Drag Ute, with BIG tyres.
Do any "experiments" on the dyno lately Bro? 
02-07-2008, 08:40 PM
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https://ls1tech.com/forums/showthread.php?t=483164
Although the pics seem to be dead now.
I think the car with that engine ran like 8.62 at 164mph or something, circa 3-3200lbs ?
Drag Ute, with BIG tyres.
Although the pics seem to be dead now.
I think the car with that engine ran like 8.62 at 164mph or something, circa 3-3200lbs ?
Drag Ute, with BIG tyres.
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If told you the cam specs in my turbo motor, you would say it wouldn't work. 
02-08-2008, 09:04 AM
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02-08-2008, 09:15 AM
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Paul and Joe are really good friends for mine! Paul helped me pick out the last cam-it made 920 rwhp on 347 with ported LS6 heads and a F1R!
02-08-2008, 09:20 AM
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I dont think its fair to compare cams in different engines, unless head flow is similar ?
LS heads seem to flow a lot more air than most, and as such, do not need such aggressive cams to make good power.
What sort of cams do the 32v Modular guys run ? Im sure these heads flow very well....although being 4v might skew things.
LS heads seem to flow a lot more air than most, and as such, do not need such aggressive cams to make good power.
What sort of cams do the 32v Modular guys run ? Im sure these heads flow very well....although being 4v might skew things.
02-08-2008, 09:26 AM
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02-08-2008, 09:33 AM
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I dont think its fair to compare cams in different engines, unless head flow is similar ?
LS heads seem to flow a lot more air than most, and as such, do not need such aggressive cams to make good power.
What sort of cams do the 32v Modular guys run ? Im sure these heads flow very well....although being 4v might skew things.
LS heads seem to flow a lot more air than most, and as such, do not need such aggressive cams to make good power.
What sort of cams do the 32v Modular guys run ? Im sure these heads flow very well....although being 4v might skew things.
02-08-2008, 09:35 AM
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That car is a work of art. I remember when Wolfe built, I thought to myself, its too nice to be on a race track...lol. It had some ***** too....235mph back 10 years ago.
02-08-2008, 03:42 PM
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24X/25X .58X/.58X 112+X
Combo is 402, AFR225's(prepped by Dave@CDNperf), LS6 intake, 7.4" .110 wall pushrods from CDNperf, Harlan Sharp modified stock rockers.
We'll be pulling the LS6 off for a Vic Jr-trying to see if we can spin the 402 to 7500 rpm.
Combo is 402, AFR225's(prepped by Dave@CDNperf), LS6 intake, 7.4" .110 wall pushrods from CDNperf, Harlan Sharp modified stock rockers.
We'll be pulling the LS6 off for a Vic Jr-trying to see if we can spin the 402 to 7500 rpm.
02-08-2008, 07:22 PM
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The lift thing will be interesting in terms of rpm ability.
I was recently given some cam choices for an EP82 Starlet turbo engine. I was surprised to see, that the "bigger" the cam got in terms of duration, the lift got smaller.
Normally lift and duration go hand in hand. But if as you say, the lift and aggressive ramps are causing valve float issues, less aggressive cams, albeit still with longish duration could be the way to get a FI build to rev ?
I was recently given some cam choices for an EP82 Starlet turbo engine. I was surprised to see, that the "bigger" the cam got in terms of duration, the lift got smaller.
Normally lift and duration go hand in hand. But if as you say, the lift and aggressive ramps are causing valve float issues, less aggressive cams, albeit still with longish duration could be the way to get a FI build to rev ?
02-09-2008, 09:09 AM
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The lift thing will be interesting in terms of rpm ability.
I was recently given some cam choices for an EP82 Starlet turbo engine. I was surprised to see, that the "bigger" the cam got in terms of duration, the lift got smaller.
Normally lift and duration go hand in hand. But if as you say, the lift and aggressive ramps are causing valve float issues, less aggressive cams, albeit still with longish duration could be the way to get a FI build to rev ?
I was recently given some cam choices for an EP82 Starlet turbo engine. I was surprised to see, that the "bigger" the cam got in terms of duration, the lift got smaller.
Normally lift and duration go hand in hand. But if as you say, the lift and aggressive ramps are causing valve float issues, less aggressive cams, albeit still with longish duration could be the way to get a FI build to rev ?