2.0L LSJ Performance Tech 205hp Supercharged SS tuner version. 200 lb-ft of torque.

Why no hybrid L61/LSJ builds?

Old 01-26-2013, 03:40 PM
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Originally Posted by DaFlyinSkwirl View Post
not really.

I had a thread on the LSJ/L61 hybrid I did (lsj bottom end, l61 head) but it got messy because it was when I was figuring out what I needed to do.

swapping heads is pretty easy. There's nothing that really needs to be modified.

it's only when you want to use a plastic intake manifold that the LSJ head needs to be modified slightly. and those mods are all related to the intake flange for the PCV system to work properly.

head-to-block interfaces are all extremely similar. the only thing you need to change inbetween them is the headgasket... for LE5 block based hybrids, you need to use a headgasket that is 88mm bore or larger.
What do you do about the cams/cam sensor? Do you just swap your L61 cams in the LSJ head?
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Old 01-26-2013, 03:59 PM
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Originally Posted by Tjolley View Post
Holy **** this is good ****...
Schools in session boys and girls.
Ive learned more in this thread than any other single thread on this website
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Old 01-26-2013, 05:57 PM
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Originally Posted by IonNinja View Post
What do you do about the cams/cam sensor? Do you just swap your L61 cams in the LSJ head?
the early L61s had two different length cams. the intake cam was longer (same length as both LSJ cams) and it spins the Jbody power steering pump.

the exhaust cam is shorter.

you can run the L61 cams in the LSJ head, but one of the cam journals in the head will be empty. It has to be filled with either a blank end-journal from a spare cam, or welded shut somehow. Not having a journal in there will cause a tremendous loss in oil pressure.

so far as cam-sensor, the cassette-style wasted spark ignition uses CSI (compression sense ignition) that fires in wasted spark (1 and 4 fire together, 2 and 3 fire together)

since only one cylinder is on the compression stroke, only one cylinder fires.

what the CSI part of the ICM circuitry does is measure the resistance across the spark plugs on the coils that are firing. The one with higher resistance is on the compression stroke, so the ICM generates a cam signal based on that.

by losing the cam sensor, you lose sequential injection. But, much higher than 3000rpm, the engine is on batch fire anyway, so sequential only really hurts MPG a tiny bit.

L61
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LSJ
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early model L61 showing the different length camshafts
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LSJ showing camshaft length detail
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again, L61 cam flange
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LSJ cam flanges. the intake flange is identical to the L61, but the exhaust flange is totally different than the intake flange.
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L61 exhaust cam is too short for the LSJ
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L61 intake flange detail
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LSJ intake flange detail (you can see the offset PCV hole)
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plastic manifolds don't like the LSJ intake flange. I modified this by cutting the manifold clear of the hole, then drilling/tapping the hole for NPT thread and running an external line
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L61 upper rad hose connection detail. The hole to the right is supposed to have a nipple.
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on the LSJ, there are two holes.. one for the ECT sensor, and another for a banjo fitting for a water pipe that goes across the head up by the fuel rail
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styrofoam look of the lost-foam cast heads (L61 here)
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sand cast heads look much nicer (and no seepage problems)
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also, the LSJ and L61 use different spark plugs. use the plugs that match the head (taper seat vs. crush-washer seal).
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Old 01-26-2013, 06:04 PM
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Your knowledge is unbelievable man thank you
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Old 01-28-2013, 11:12 PM
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Always wondered myself why more of these haven't been done. Ever since I learned about them a while back ago, been wanting to do one. I have a couple hybrid builds planned out now and can't wait to get them done.
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Old 02-08-2013, 07:50 AM
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Nope ur lsj parts bolt right in..just need 88mm pistons and 88mm hg
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Old 02-12-2013, 02:04 PM
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I can get a sleeve made for the le5 with a finish bore of 94mm

so that opens up the stroker/hybrids we can do such as
bore stroke
94mm x 98mm = 2.7
94mm x 94mm = 2.6
94mm x 86mm = 2.4
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Old 02-12-2013, 02:38 PM
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What compression with that higher displacement? 10:1?
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Old 02-12-2013, 02:42 PM
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what ever you want it to be
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Old 02-12-2013, 02:49 PM
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Originally Posted by mrbelvedere View Post
I can get a sleeve made for the le5 with a finish bore of 94mm

so that opens up the stroker/hybrids we can do such as
bore stroke
94mm x 98mm = 2.7
94mm x 94mm = 2.6
94mm x 86mm = 2.4
I may have **** when I saw this. I wanna build this! haha
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Old 02-12-2013, 03:01 PM
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I like to ****
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Old 02-12-2013, 03:54 PM
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Yes! a 2.7 Stroker would be ****. what would it cost though to have the sleeves and pistons made?
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Old 02-12-2013, 08:23 PM
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2.7 would definitely be awesome.
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Old 02-13-2013, 12:09 AM
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maybe there is more knowledge in this thread then the VVT thread. Anyone know if you can use LE5 aftermarket cams in the LAP? a lot of LAP guys would love to have cams.

also 2.7 would be sick ****
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Old 02-13-2013, 04:59 AM
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Originally Posted by rcarr0327 View Post
maybe there is more knowledge in this thread then the VVT thread. Anyone know if you can use LE5 aftermarket cams in the LAP? a lot of LAP guys would love to have cams.

also 2.7 would be sick ****
to my understanding, the VVT cams are unique to their own engine.

however, again, my knowledge of the VVT setups is extremely limited at best.
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Old 02-21-2013, 03:07 PM
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Thoughts on running a LSJ head, LE5 Block, and LSJ crank... It would need custom length rods right? Also if you bored it out to get that higher displacement and sleeved it.. custom pistons?
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Old 02-21-2013, 04:33 PM
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Originally Posted by ThexGovenor View Post
Thoughts on running a LSJ head, LE5 Block, and LSJ crank... It would need custom length rods right? Also if you bored it out to get that higher displacement and sleeved it.. custom pistons?
what you are refering to is a 2.1 big bore and there are several out there the 2.4 sleeve is also .060 thick same as lsj and you can run a lsj head on a 2.4 no problem all you need is a le5 head gasket and custom pistons you can use stock length rods
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Old 02-22-2013, 03:07 PM
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L61 lsj le5 lnf all have the same deck hight 8.700 is factory i think.
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Old 02-22-2013, 04:34 PM
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Originally Posted by mrbelvedere View Post
what you are refering to is a 2.1 big bore and there are several out there the 2.4 sleeve is also .060 thick same as lsj and you can run a lsj head on a 2.4 no problem all you need is a le5 head gasket and custom pistons you can use stock length rods
I was referring to your earlier post about being able to make a 2.7 is that on an LE5 block bored out with a longer stroke?
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Old 02-22-2013, 05:12 PM
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The guy I bought my turbo off from was a 2.2 bottom end, and an lsj head. He also made over 600whp on the turbo setup. Was cleanly done as well. Ended up shearing his flywheel bolts off in the crank. I guess the lsj has 8 for a reason lol
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Old 02-22-2013, 05:15 PM
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I have a sleeved 88mm bore block that will need to be bored out to at least 89mm. Anyone know if the le5 head gasket will clear the bore and not over hang into the combustion chamber ?
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Old 02-22-2013, 05:21 PM
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Originally Posted by ThexGovenor View Post
I was referring to your earlier post about being able to make a 2.7 is that on an LE5 block bored out with a longer stroke?
LE5 is a 88mm bore/ 98mm Stroke, the 2.7 is a punched out 2.4 block to 94mm
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Old 02-22-2013, 05:31 PM
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Yep thats what I was referring to.
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Old 02-22-2013, 08:20 PM
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you wont punch a 2.4 out to 94mm not enough meat
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Old 02-22-2013, 09:00 PM
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not unless u want 2mm sleeves lol
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