Chevy HHR Network - 2.4L Engine Build

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2.4L Engine Build

She'll either make power like mad, or you'll have a grenade with the pin pulled out on your hands, keep us posted on the buildup. We await the dyno printouts with baited breath. :smile:

hhrfreek- Cool man..

So you lowered the C/R for the blower... I'm following along..

I use JE pistons in my flathead stroker .. Good stuff.

very interesting experiment.
You may need to upgrade transmission and cooling system, as well as brakes.

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She'll either make power like mad, or you'll have a grenade with the pin pulled out on your hands, keep us posted on the buildup. We await the dyno printouts with baited breath.

LOL. Thats how I feel now. I will be more comfortable when the build is over knowing the pistons and rods are good to at least 900whp.

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So you lowered the C/R for the blower... I'm following along..

Yessir:thumb: I wanted to do 9.5 since my boost is going to be around 15, but ZZP has 9.0/10.4 JE Pistons readily available. I am taking a hit with hp on the low compression, but hopefully I can get most of that back by leaning it out and throwing some timing at them. The rods are .01" longer though, so that will make my compression slightly more than 9.

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very interesting experiment.
You may need to upgrade transmission and cooling system, as well as brakes.

The manual transmission is pretty stout. If something breaks I will just get another used one. The F23 is known to hold up on builds of over 400whp. Our cooling system is also very efficient already. Temperature fluctuates like it did N/A. The brakes...I wish I had disc all the way around, but in the spring I will be picking up some better rotors and pads...mine are original and they are corroding as they are going on 6 years old. After a few hard stops I start to get a shimmy guessing because they can't cool quickly anymore.

sounds interesting I have been running the roots style blowers for a while on my drag street car
With the whp you posted I think you would be around a 13.60 with the old build and low 12's with the new build on e85
Of course that's with good traction etc
Have you ever considered seeing what it runs either 1/8 the mile or 1/4 mile
Also how much did you have invested in putting the blower on originally .
Sounds like a great sleeper

I did go to the track with it a while back probably~230ish whp and did 15.1 @ 95. I hope to be around 13 flat as that is what many of the quicker SS models are running. I originally spent around $2300 for the kit.

Updated the original post with more pictures.

Progress update: I am hoping to have the exhaust side of the head port finished tomorrow as well as the cylinder honed/deglazed and the new rods and pistons installed.

Picking up new rod bearings tomorrow and also ordering a set of valve seals.

Check out the difference in a forged 900whp tested rod(ZZP) vs the stock rods which gm suggests replacing at 250whp. The JE pistons are supposed to be good to 1000whp...so I am good there too lol. The beefy parts are also a 100g lighter per cylinder than the stockers and good for a lot more. The JE ringlands are 1.7 mm thicker than the stock pistons as well.

Some stout goodies, for sure..

Using the stock crank ?

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Originally Posted by sleeper (Post 609894)

Some stout goodies, for sure..

Using the stock crank ?

Good question about the crank?

Also i am assuming and hoping you are planning on having the rotating assembly balanced?