Super late model motors

[Jking24]

The LS is going big time https://m.facebook.com/ScottBloomqui...48&__tn__=EH-R

I guess you didn't watch the race

[billetbirdcage]

ry 45 ???? just curious

Yes, an RY45

[Rajflyboy]

The LS is going big time 👍https://m.facebook.com/ScottBloomqui...48&__tn__=EH-R

[grt74]

Again it depends on what you have. The fords a few of my guys use are all a Spintron tested combo so valve train problems are basically non existent even at 9500 RPM, the biggest concern is really pulling a rod apart due to the massive piston speed at those RPM's. I would not recommend that many laps on a typical LM engine unless it was a very researched out combo and had spintron testing done.

After 1200 laps the engine was down 8 HP so we now run closer to 2000 laps and had no issues.

ry 45 ???? just curious

[billetbirdcage]

WOW 2000 laps! Is that common place now? Malcuit told us 1000 on our 415 Ford and 1200 we were on "borrowed time" this was in 1998 though

Again it depends on what you have. The fords a few of my guys use are all a Spintron tested combo so valve train problems are basically non existent even at 9500 RPM, the biggest concern is really pulling a rod apart due to the massive piston speed at those RPM's. I would not recommend that many laps on a typical LM engine unless it was a very researched out combo and had spintron testing done.

After 1200 laps the engine was down 8 HP so we now run closer to 2000 laps and had no issues.

[westlingracing]

We have ran LS since 2014. Started using the ct525 in ump. Even made half the summer national shows that year with them.. in 2016 we did modify them with Baldwin. We can make close to 700 with 93 octane pump gas and still us a hydraulic cam. We got around 3000 laps before we had a stock valve fail. Bearings, rings still looked new. Can't do that with a sbc!

[dirtcrazy4u]

Yea strictly pump gas EFI would be the way to go. The touring guys are not running pump gas. Many swap out carbs in any given night just because of track conditions and can fine tune the carb. You don't have that flexibility with EFI . At least not until they let you get out the laptop and that's a whole new ballgame.

[fastford]

Not the case carburetors routinely make more horsepower than fuel injection in head to head competition even on pump gas. The horse power numbers they make are irrelevant what matters in latemodels is drivability and a broad smooth power range. If the big number was all that matterd Baldwin ls engines would already be on the pole of every major event nationwide

im not saying carbs want work , i am a carb man my self , but on pump gas , there is no way to control high compression near as well as with efi and timing control { ie: knock sensors } , and for smooth power curve , its efi hands down,,,,jmo

[Car Biz]

It really depends on what stroke/CID motor you have and what brand too be completely honest. With the Ford we run 2000 laps, we could never go that far with a Chevy and didn't turn as many RPM's and was 30 to 40 HP short of the ford. 1200ish is about as far as we would push the Chevy.

I'm talking full on super engines: 430+ CiD, 875 to 925HP, 8600/9400 RPM stuff

WOW 2000 laps! Is that common place now? Malcuit told us 1000 on our 415 Ford and 1200 we were on "borrowed time" this was in 1998 though

[billetbirdcage]

Concerning rebuild/freshen intervals, is 1000 green flag laps still a good rule of thumb?

It really depends on what stroke/CID motor you have and what brand too be completely honest. With the Ford we run 2000 laps, we could never go that far with a Chevy and didn't turn as many RPM's and was 30 to 40 HP short of the ford. 1200ish is about as far as we would push the Chevy.

I'm talking full on super engines: 430+ CiD, 875 to 925HP, 8600/9400 RPM stuff

[Jking24]

Flyboy yes basically

[Jking24]

Thanks, Is that for steel and aluminum both?

I was speaking to aluminum super latemodel engines. Generaly the less horsepower you make the more laps you get many steel block engine builders say 1500-1800 laps some crate guys go 2500+. It all comes down to power and what parts were used their are ways to free up 30+hp but in doing so your down in the 600-800 lap range. Everything is a give and take

[Rajflyboy]

By LS ...I’m assuming you mean these: https://en.m.wikipedia.org/wiki/Gene...l-block_engine

[bullittwrench]

Thanks, Is that for steel and aluminum both?

[Jking24]

Concerning rebuild/freshen intervals, is 1000 green flag laps still a good rule of thumb?

Yes generally between 1000-1200 some guys go 1500