Dished Pistons

[Eglider05]

I'm in the process of doing some research for a possible 107-117 build. Can anyone give me specs on the negative dome sizes available (i.e. -2cc)? I'm trying to figure out a way to get my compression where I want it without messing with the heads and want to know what my options are.

Thanks,
Rick

[rbabos]

I'm in the process of doing some research for a possible 107-117 build. Can anyone give me specs on the negative dome sizes available (i.e. -2cc)? I'm trying to figure out a way to get my compression where I want it without messing with the heads and want to know what my options are.

Thanks,
Rick

Head Quarters has CP -7 cc dished pistons for the 107
Ron

[Eglider05]

I'm in the process of doing some research for a possible 107-117 build. Can anyone give me specs on the negative dome sizes available (i.e. -2cc)? I'm trying to figure out a way to get my compression where I want it without messing with the heads and want to know what my options are.

Thanks,
Rick

Head Quarters has CP -7 cc dished pistons for the 107
Ron

Good info thanks. That would put me right at 10.0 on a 107 with my 84cc heads. Is there a down side to the dished pistons?

Rick

[rbabos]

I'm in the process of doing some research for a possible 107-117 build. Can anyone give me specs on the negative dome sizes available (i.e. -2cc)? I'm trying to figure out a way to get my compression where I want it without messing with the heads and want to know what my options are.

Thanks,
Rick

Head Quarters has CP -7 cc dished pistons for the 107
Ron

Good info thanks. That would put me right at 10.0 on a 107 with my 84cc heads. Is there a down side to the dished pistons?

Rick

Not that I'm aware of . But I've only used one set.
Ron

[rob71458]

What about the loss of squish (quench), with a dished piston?

[glens]

Why would there be a loss of squish?  The perimeter is still full height, no?

[rob71458]

Yes, but I would think it's not going to be as effective as a flat top. Lets see what the Pro's have to say.

[DBC]

There is nothing wrong with using a dished piston.

[Eglider05]

Does anyone have any info on what's available in a 117" dished piston?

Thanks,
Rick

[rbabos]

Does anyone have any info on what's available in a 117" dished piston?

Thanks,
Rick

If I'm not mistaken some of the builders take a flat top and dish them to suit. That might be one option.
Ron

[Eglider05]

Does anyone have any info on what's available in a 117" dished piston?

Thanks,
Rick

If I'm not mistaken some of the builders take a flat top and dish them to suit. That might be one option.
Ron

That's my understanding as well. I'm just trying to figure out how far they can go with the various piston sizes.

Rick

[Powerglides]

The HQ 107 pistons are a flat top. They also have a corrected compression height that brings them flush with the top of a bored out OEM cylinder when using a stock 96" crank. You will be around 10.5 compression with the HQ .030 head gaskets and 84cc chambers.
I believe that their 113 pistons are -7cc.

[Hillside Motorcycle]

Does anyone have any info on what's available in a 117" dished piston?

Thanks,
Rick

Up to 5cc's can be pulled from a J&E 4 1/8" flat top, and still maintain proper dome thickness.
J&E also has them available in a minus 10 cc's.
Scott

[rbabos]

The HQ 107 pistons are a flat top. They also have a corrected compression height that brings them flush with the top of a bored out OEM cylinder when using a stock 96" crank. You will be around 10.5 compression with the HQ .030 head gaskets and 84cc chambers.
I believe that their 113 pistons are -7cc.

That's correct. I was looking in the wrong kit.
Ron

[Eglider05]

Thanks a lot for the help guys. This info helps out a lot, especially finding out I can go up to -10 if needed.

Thanks,
Rick