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Author Topic: Dolmar 7900 Porting Info  (Read 14984 times)

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Re: Dolmar 7900 Porting Info
« Reply #90 on: July 02, 2014, 11:02:14 am »
I wonder how close the 665 cyl looks to this 65cc cyl I have for 2 poulans. 

I do love the quad ports for these saws best so far.

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Re: Dolmar 7900 Porting Info
« Reply #91 on: July 02, 2014, 11:04:40 am »
A thicker base flange on the Solo jugs would possibly explain why Randy gets the same numbers on both 7900 and 681 saws.
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Re: Dolmar 7900 Porting Info
« Reply #92 on: July 02, 2014, 11:19:22 am »
It took me three tries on the same 681 to get the gains I was hoping to see.

I trashed the first top end, then tried a 272 piston, then just got a new OEM top end and started over.

That saw has so much torque stock, that it can be difficult to get big gains in a work saw type build.

I finally make a saw I was proud of from it........and learned a bunch in the process.
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Re: Dolmar 7900 Porting Info
« Reply #93 on: July 02, 2014, 11:25:07 am »
Nate username here solo. Has a stock strong 681 he runs in 5ci stock saw races. He has had another racer ( the guy is sort of a dickhead as I know him after meeting at races )  challenge him and his saw at race after winning with it again.
Causing the 681 to be opened up and checked for any work.   Yep it was stock.
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Re: Dolmar 7900 Porting Info
« Reply #94 on: July 02, 2014, 11:31:26 am »
Solo 681 hot saw running pump gas, 6 transfer port design, cutting a 20" pine round with non race chain.  Out west I think

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Re: Dolmar 7900 Porting Info
« Reply #95 on: July 02, 2014, 11:33:39 am »
Any other 681 videos I am going to post down in that solo 681 thread.  Unless I find Nate's stock saw run.
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Re: Dolmar 7900 Porting Info
« Reply #96 on: July 02, 2014, 11:58:24 am »
Kevin, that saw is built by Mark Eckhardt out here in California.
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Re: Dolmar 7900 Porting Info
« Reply #97 on: July 02, 2014, 12:01:37 pm »
Quote from: adam32 on July 02, 2014, 11:58:24 am
Kevin, that saw is built by Mark Eckhardt out here in California.

Seen the last name on videos but didnt know for sure. Thanks. 

I just posted some video of a alky nitro 3120 he is tuning now too.
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Re: Dolmar 7900 Porting Info
« Reply #98 on: July 02, 2014, 12:05:37 pm »
Saws for racing are not something I'm at all interested in.

One of these days I might try again to get into that......but I can't ever see me liking that stuff.
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Re: Dolmar 7900 Porting Info
« Reply #99 on: July 02, 2014, 12:40:54 pm »
Quote from: Mastermind on July 02, 2014, 12:05:37 pm
Saws for racing are not something I'm at all interested in.

One of these days I might try again to get into that......but I can't ever see me liking that stuff.

Same here... but I'm starting to get more extreme on work saws.  Strokers, different carbs, and a little added material here and there to the jug. 
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