Winter build Stock CID project

[tpepmeie]

Here's some eye candy from the new project. Stock pistons, machined for valve reliefs. This will make room for a fairly aggressive cam lift. Wonder what's possible from 350cid??? :icon_scra

[efnfast]

Do we know what the current hp leader is for 350 CID LT5?

[tpepmeie]

Not really. I don’t believe anyone has tested one on an actual engine dynamometer. I plan to test this one.




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[efnfast]

I'm currently 451 at the wheels and didn't think there was much left without adding cubes. Maybe a little more with more aggresive cams. Which of course is exactly what you are looking for.

[Billy Mild]

Problem with really aggressive cams, that if it requires piston mods you have to teardown the motor anyway.

You should be able to squeeze almost 100hp/liter with a tricked out engine.

[efnfast]

At 15% loss, I calculate to 530. That's 93 per liter. I'm not sure I'd want more cams and still have to drive it on the street.

[jss06c6]

Watching with interest!!

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[Paul Workman]

At 15% loss, I calculate to 530. That's 93 per liter. I'm not sure I'd want more cams and still have to drive it on the street.

Pete said at one point in his motor's development that he was putting 474 HP to the wheels. Since then he has tweaked it a little more, he said.

Using the same math, that would tickle 557+ @ the crank, and his 11.04 at 129+ in the quarter, and IIRC* ~156 mph(?) in the half mile.

I don't know whether Pete has "eyebrow" cut his pistons or not. But, his 350 put on quite a show at many events, including BG!

One of his runs at Byron before the last mods.

https://www.youtube.com/watch?v=SFNFOhGGlR4

He says he keeps the secret in a Mason jar buried in the back yard.:mrgreen:

[XfireZ51]

I believe Pete’s numbers use SAE correction.

Todd,

Are u thinking larger valves as well? Increase lift on Intake or Exhaust or both?

[-=Jeff=-]

One of his runs at Byron before the last mods.

https://www.youtube.com/watch?v=SFNFOhGGlR4

He says he keeps the secret in a Mason jar buried in the back yard.:mrgreen:

:cheers:

But those videos are from Union Grove ;)

[tpepmeie]

At 15% loss, I calculate to 530. That's 93 per liter. I'm not sure I'd want more cams and still have to drive it on the street.


Pete said at one point in his motor's development that he was putting 474 HP to the wheels. Since then he has tweaked it a little more, he said.

Using the same math, that would tickle 557+ @ the crank




You guys know what I think about converting rwhp on a dynojet to brake horsepower on an Engine dyno...

[efnfast]

You guys know what I think about converting rwhp on a dynojet to brake horsepower on an Engine dyno...
Sure Todd, but that's all most of us can do. -Steve

[tpepmeie]

427 LT5 build 1 observations

1/19/2011: SF901 Engine Dyno, 300 rpm/sec, SAE1349 correction - 669 bhp [703 using STP correction]
8/9/2012: Dynojet shop "A", SAE1349 correction - 637.2 rwhp
5/10/2013: Dynojet shop "A", SAE1349 correction - 638.2 rwhp
5/10/2013: Dynojet shop "B", SAE1349 correction - 634.1 rwhp


I realize this is but one like-for-like comparison, but three different chassis dyno tests, across two days and two shops, and nearly 1 year apart. the variance is 4 hp.

The same engine, on the superflow engine dyno, at the same atmospheric correction, was only 30-35 hp higher. Maybe that engine dyno is a bit stingy? However, using the internet accepted 15% driveline loss, that engine should have made close to 750 brake horsepower on the engine dyno. Unlikely.

I've tested a couple others on that engine dyno, but unfortunately haven't done a chassis dyno on those. Not my engines, so not so easy to do the comparison testing.

Sorry, didn't mean to get off topic. I'm expecting a solid 550-560 brake hp out of this cammed 350 cid project.

[Top Toy]

Engine dyno numbers don't make good comparison points, either, because you're no longer using using the in car accessories (IAF housing, exhaust, cooling, drivetrain et al). The only valid comparison is SAE on the same day and same chassis dyno. Should also be based on area under the curve to account for the full range of operation, not just a one point spike or engine tuned for peak HP only. Anyone up for a shoot out? [emoji6]

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[Hog]

This will be an awesome project Todd, looking forward to t. I would think that your stock cube LT5 will have a little extra noise from the rectangular cam lobes you'll be using (j/k)

I made a splinter thread in case anyone wants to discuss the virtues of the various methods of measuring engine output.
http://www.zr1.net/forum/showthread.php?p=274527#post274527

[tpepmeie]

And she’s done. Sad to see it go, but there’s a race to make!

7991




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