Author Topic: Dolmar 7900 piston choices  (Read 6953 times)

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Offline mdavlee

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Re: Dolmar 7900 piston choices
« Reply #10 on: November 29, 2011, 06:19:49 pm »
I thought the 7900 used a windowed piston for the whole time. I remember cutting scott posting about a new updated one a couple months back. I remember romeo used the 272 piston in the 7900. I haven't researched it in a long time since I sold the 2 I had.

Offline bloodontheice

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Re: Dolmar 7900 piston choices
« Reply #11 on: November 29, 2011, 08:00:27 pm »
The one I have is a new top end and no windows in this piston, I'll post pictures tomorrow if I get a chance.

Offline mdavlee

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Re: Dolmar 7900 piston choices
« Reply #12 on: November 29, 2011, 08:24:30 pm »
I found the thread over there. The new updated piston has no windows.

Offline Cut4fun .

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Re: Dolmar 7900 piston choices
« Reply #13 on: December 17, 2011, 05:27:09 pm »
Anybody else heard of the Wiseco 52mm pistons being put in the hot woods ported 7900's out there. Anyone else using them?

I had heard about them being made for the 5ci builds in 52mm bore racesaws in 372xp with 2mm stroked cranks. But this is the first I have heard of a wiseco going into the 7900's.
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Offline EHP

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Re: Dolmar 7900 piston choices
« Reply #14 on: February 27, 2012, 09:46:12 am »
in 1 month I will have wide skirt pistons ,  skirt width of 1.66 inch in 12mm pin size but will need a spacer as they were based off of the 272 piston  and with the wider skirt its easier to fit the piston into the crankcase when with a lower pin location

Offline EHP

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Re: Dolmar 7900 piston choices
« Reply #15 on: May 04, 2012, 04:39:07 pm »
Cut I pit a picture of the wide skirt 52mm  piston on my site , picture is to big to post here

Offline Cut4fun .

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Re: Dolmar 7900 piston choices
« Reply #16 on: May 04, 2012, 05:37:34 pm »
Cool. Is it OK to leach your pic there and post here for other signed in members to see?  I will embed it so guest cant see it.  ;)
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Offline EHP

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Re: Dolmar 7900 piston choices
« Reply #17 on: May 04, 2012, 07:05:45 pm »
sure go a head

Offline Cut4fun .

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Re: Dolmar 7900 piston choices
« Reply #18 on: May 04, 2012, 08:15:57 pm »
Thanks Ed. I'll let you give the info and weights etc.
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Offline EHP

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Re: Dolmar 7900 piston choices
« Reply #19 on: May 04, 2012, 09:08:32 pm »
piston on left is a 7900 used piston, with ring it weighs 85.4 grams , skirt width of 32mm/ 1.260 inch
middle is the wide skirt wiseco piston, with ring it weighs 79.7 grams and has a skirt width of 1.670 /42,5mm
right piston is a stock 272 piston weight was 82.9 grams with ring , skirt width is 35.83mm/1.414 inch,
so race piston is wider and lighter and will fit the 7900/272/460 stihl , I built this piston maining for a race piston and to be run on alcohol/nitro, as you can see its coated everywhere , I also have pistons made in 60mm, 62mm, and 66mm

 

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