Predator Hemi Bullfrog Motorsport High Comp Piston

[scottygrape]

Has anyone ever used one of these high compression pistons from bullfrog motorsports in a Hemi predator? According to their website with no other mods it gets you to 11:1 compression. I was thinking it'd be a lot wiser to do this than mill my head to get 11:1

http://www.bullfrogmotosport.com/product-p/200.1004.htm

 

[Whitetrashrocker]

That's cool. I'd like to see the results if you do get it.

 

[KartFab]

holy crap 11:1?

Id call them to make sure you get the right connecting rod though as it "fits" three of them. Thats a snazzy piston though, and if you can keep the stock headgasket with the correct piston to head clearance, you wont even have to worry about cutting chromemoly rods to length, they would just fit at stock length!

 

[Scout]

I'd have to run premium in my kart...
What kind of HP do you think you could get with that? It looks like you'd probably have to use the stock head, I don't think a 14 cc head or a welded head would fit the dome.

I might have to consider that one.

 

[scottygrape]

I am thinking that it will be a good upgrade. If I use this piston, Hemi head and a black Mamba Jr cam I should have a pretty stout running motor.

 

[Scout]

I am thinking that it will be a good upgrade. If I use this piston, Hemi head and a black Mamba Jr cam I should have a pretty stout running motor.

That's exactly my setup! I'm still waiting on my piston, it's been a week. I think I'm going to stud the head and sidecover while I'm at it.

---------- Post added at 10:29 AM ---------- Previous post was at 09:45 AM ----------

I emailed and here is the response.

Hello Matt,

We are expecting to be restocked with these pistons by end of this week. We just missed the anticipated demand for these pistons. Sorry about that, but we are working hard to get them back in stock.

Thanks,
Jeremy

 

[rk970]

Holy valve shrouding...

 

[Scout]

Still don't have it. If I don't have it friday ill send another email.

 

[Scout]

I have it installed, put some clay in the valve pockets and it looks good. I just don't know which piston rings goes on top, one looks cast and the other looks copper coated. I need to get the right socket for the rod bolts, but I should have it back together this weekend.

 

[bob58o]

Make sure you let us know when you figure out the piston rings.
I have never removed, installed, or replaced piston rings before.
Show us some pics when you do.

Are they gapped correctly already?

I think I got a 1/4" drive 1/4" 12pt socket from Sears.
http://www.searshardwarestores.com/...f1nbUUx_ItM7O8jH3KLzIZFe-p_5-3covmBoCsO7w_wcB

and a 1/4" drive inch pound torque wrench for 10 bucks on sale at HF

 

[Scout]

I have to go to Sears to get the socket.

Iirc the ring gaps were around 0.015" for the compression rings, and the oil rings were considerably larger.

I've got the piston in the bore already, but I looked at the stock one and installed the rings the same way. Iirc the cast looking ring was on top, so that's how I installed the new ones.