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
Quote from: Eglider05 on October 25, 2011, 01:58:53 PM
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
Quote from: rbabos on October 25, 2011, 02:29:08 PM
Quote from: Eglider05 on October 25, 2011, 01:58:53 PM
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
Quote from: Eglider05 on October 25, 2011, 04:00:50 PM
Quote from: rbabos on October 25, 2011, 02:29:08 PM
Quote from: Eglider05 on October 25, 2011, 01:58:53 PM
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
What about the loss of squish (quench), with a dished piston?
Why would there be a loss of squish? The perimeter is still full height, no?
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.
There is nothing wrong with using a dished piston.
Does anyone have any info on what's available in a 117" dished piston?
Thanks,
Rick
Quote from: Eglider05 on October 26, 2011, 09:03:37 AM
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
Quote from: rbabos on October 26, 2011, 01:46:08 PM
Quote from: Eglider05 on October 26, 2011, 09:03:37 AM
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
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.
Quote from: Eglider05 on October 26, 2011, 09:03:37 AM
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. :smile:
Scott
Quote from: Powerglides on October 26, 2011, 03:21:49 PM
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. :doh:
Ron
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