View Full Version : Tpis 427 L92 Results


Trail 70
02-04-2007, 03:50 PM
A very big thanks to TPIS. After alot of R-D on the dyno my 427 with a hyd. cam street engine did 670hp. and 570tq. It made over 600hp. at 5700 and pulled all the way to 7500. I will have some rwhp numbers for you guys soon.

ringram
02-04-2007, 04:37 PM
Full engine specs please Sir plus dyno sheet

VortechC5
02-04-2007, 04:44 PM
Nice numbers! :cheers:

What did you use for a cam? What work was done to the L92s?

1bigcam
02-04-2007, 04:47 PM
that should be like 600 at wheels thats great,spec's on the heads

BlownVette 2001
02-04-2007, 05:40 PM
Nice numbers.

Looking forward to Dyno info and motor build specs, Congrats !!! :)

03 BUSA
02-04-2007, 07:26 PM
Very interested in the head flow numbers and cam specs. I am so glad that this L92 deal is not just hype. Very Cool. My goal was mid 500's hp and tq but seeing what these L92's are really doing I feel that might be a conservative goal.

Trail 70
02-04-2007, 08:05 PM
Work was done to help the exhaust side and mid lift flow numbers at .400 the heads did over 290, .500 over 320, .600 335. and over 340 at .650. The intake to exhaust ratio was 74%. TPIS hand made the sheet medal intake and after trying 3 cams, it was 249, 258, 630, 630 on a 114.5 lobe. The engine pulled 831 cfm on the dyno. We found that a larger header really help with these l92 heads.

Bink
02-04-2007, 09:15 PM
We found that a larger header really help with these l92 heads.

1 7/8" or 2" primaries?

1bigcam
02-04-2007, 09:35 PM
what did the intake cost you? why did you go that way?

SDB
02-04-2007, 10:31 PM
why the 114+ lobe? Planning on juice? Great numbers. Interesting to see what a FULL port job would yield, maybe another 20 hp at peak. Did they dyno with L76 intake by chance?

SDB

Trail 70
02-05-2007, 09:13 AM
We tried a World Challenge cam out of one of there race cars with close to the same spec's but on a 110 lobe the engine was a dog... Same results with a 112 lobe. We picked up 25hp from going to 1 3/4 to 1 7/8 and were able to run 4 more deg. of timing. We think that the 1 7/8 to 2in or a 2in header would be better. We never tried a L76 intake... The cam really liked to be retarded. The L92 really are sensitive to cam events for making power, more so then the ls base heads. Lots of cfms but velocity is slower on the runners of these heads. The L92 needs lots of cubic in. or a blower set up or RPMS to really see the best results.

Katech_Jason
02-05-2007, 10:03 AM
A very big thanks to TPIS. After alot of R-D on the dyno my 427 with a hyd. cam street engine did 670hp. and 570tq. It made over 600hp. at 5700 and pulled all the way to 7500. I will have some rwhp numbers for you guys soon.


Good chance this is one of our blocks. Is it?

SDB
02-05-2007, 01:18 PM
I am wondering if 416 cubes is going to be enough with the heads fully done (i.e., 360-370 cfm intake 245 exhaust), although with the limitations of the L76 intake, probably a good size engine overall. It woudl be interesting to see someone take a 450+ motor with these heads, but that kind of defeats the whole purpose of a budget head. I like the fact that the motor liked the 114 lobe better than the tighter one....better drivability and likes the juice more!

Thinking... a L92 short block 416, fully done L92 heads, L76 intake/TB/Fuel rails?injectors, port inake and TB, big cam (like the one used here 114 lobe 249/258 .630/.635 or so), and spin it to 7500 rpms. Of course the only problem is the intake limiting high hp and what "cheap" valvetrain to use.

Really want to see more people start doing 360-416 cube shortblocks with FI, maybe a nice D1 blower with the heads and intake all done up would get some killer results!

Trail 70
02-05-2007, 08:08 PM
No 6.0l Iron Block

briannutter
02-06-2007, 07:34 AM
Pump gas right? Do you remember the compression ratio you were able to get away with.

Stang's Bane
02-06-2007, 07:38 AM
Pump gas right? Do you remember the compression ratio you were able to get away with.
12.8-1 E-85 if I remember correctly.

Trail 70
02-06-2007, 09:11 AM
12.8 to 1 comp. 100 oct. on the dyno. We never had knock. Yes on the streets it runs on E-85 tuned by Andy at dynotune in Watertown S.D. This engine has been on E-85 for a full year.

SDB
02-06-2007, 12:46 PM
E85 is what, 105 octane? What all fittings did you need to change to use E85?

Interesting stuff this spring....L92 headed big cube NA motors, hopefully some FI/L92 400+cube motors, running 105 octane pump fuel....cheap power for a daily driver to be sure!

mike c.
02-06-2007, 05:16 PM
sent you a pm.

valdeztke
02-08-2007, 11:17 AM
This may be a really "dumb" question:

Can you use the L92's on an LS6 w/ a maggie?

1bigcam
02-08-2007, 11:28 AM
i dont think so intake wont bolt up

kcmags
02-08-2007, 12:59 PM
E85 is what, 105 octane? What all fittings did you need to change to use E85?

Interesting stuff this spring....L92 headed big cube NA motors, hopefully some FI/L92 400+cube motors, running 105 octane pump fuel....cheap power for a daily driver to be sure!

408/L92 with a D-1 & alky to be running in the next couple weeks. :chug:

FRDnemesis
02-08-2007, 03:28 PM
408/L92 with a D-1 & alky to be running in the next couple weeks. :chug:


Now, thats what I want to see :hail:

Beaflag VonRathburg
02-08-2007, 03:36 PM
that should be like 600 at wheels thats great,spec's on the heads

I seriously doubt that 670 fwhp will make 600 to the wheels. Probably not even close, more like 570ish. Those are definetly great results though.

triumphman
02-08-2007, 10:17 PM
Nice motor big guy!!!!!!!!!!!!!!! that engine builder over ther knows his shit..lol

Trail 70
02-09-2007, 01:11 PM
Thanx Clay, Next winter LSX and 511 cubic in. That's what I'm talking about. 2 million horsepower next year.

triumphman
02-10-2007, 10:26 PM
sounds good , just 2 million......... have to buy a new dyno!!!!!!!!!!!!!

LEANDRO
02-25-2007, 11:08 AM
The cam really liked to be retarded.
Just like the guy behind the wheel. :drive: ha ha ha

CODE4LS1
02-25-2007, 01:01 PM
FWIW 670 FWHP = ~570 RWHP through a 6 speed (15% loss), 670 FWHP = ~536 RWHP through auto (20% loss).

1bigcam
02-25-2007, 05:15 PM
why do stock 2005 gto's put down 340 hp whp when they are rated at 400 flywheel

NoGamesLS1
02-25-2007, 05:21 PM
This may be a really "dumb" question:

Can you use the L92's on an LS6 w/ a maggie?
The l92 heads for sure will not bolt onto the ls6 block because it has too small of a bore. As for the maggie bolting to the heads I dont think that would work either because they use a different intake.

FRDnemesis
02-25-2007, 11:40 PM
why do stock 2005 gto's put down 340 hp whp when they are rated at 400 flywheel


Its based on a percentage of drivetrain reduction. As a rule of thumb with most of us, yes it works out to about 60hp +/- a few. But with numbers as high as these big cube guys are making, the number (percentage) eats a larger chunk of the number. Not sure if clarified or clouded the issue.

Example: 500 - 15%= 425hp (75hp loss) 1000 - 15%= 850hp (150hp loss)