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Author Topic: Dolmar 7900 Porting Info  (Read 8693 times)

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Offline Cut4fun .

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Re: Dolmar 7900 Porting Info
« Reply #100 on: July 02, 2014, 05:40:38 pm »
Quote from: KilliansRedLeo 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.

Still trying to figure out how Solo compensated for the 1mm increase in stroke without using a spacer. They could have increased the thckness of the cylinder base, the actual bore in the jug is deeper, or perhaps they did something to the piston. At this point we do not know.

Just going by the BB7900 aftermarket cylinder kit.   Goes on 7900 without anything special at base bolt on.
681 uses 1.5mm spacer to work on 681. That tell me the extra must be on the cylinder. Just my WAG.




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Offline KilliansRedLeo

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Re: Dolmar 7900 Porting Info
« Reply #101 on: July 03, 2014, 09:40:10 am »
Just came across two NOS Solo 665 power heads. Don't know what I an going to do with them yet but I promised to send one off to Randy for him to play around with, I know what is going to happen with one. Want to see if Randy can get more out of the quad port closed cylinder than the OP Dolmar 6400.

My source still has a few left if anyone is interested but I believe less than 10 left. No 675 or 681 saws are available!
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Offline Mastermind

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Re: Dolmar 7900 Porting Info
« Reply #102 on: July 03, 2014, 09:50:20 am »
Send me one to play with......and I'll send it back when I'm done for you to compare to the stock one.

What is the price on one????
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Offline KilliansRedLeo

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Re: Dolmar 7900 Porting Info
« Reply #103 on: July 03, 2014, 10:33:38 am »
Randy PM sent, I will need an address to ship the saw to. I may also ship another 665 jug in case something bad happens or you want to try more than 1 idea!

Tim
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Offline Mastermind

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Re: Dolmar 7900 Porting Info
« Reply #104 on: July 03, 2014, 10:35:58 am »
Replied to...
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Offline KilliansRedLeo

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Re: Dolmar 7900 Porting Info
« Reply #105 on: July 03, 2014, 10:48:27 am »
I purchased 2 units that will be shipped today via UPS. When they arrive I'll stick my inspection camera down the plug hole and get some pictures of the ports and post for all to see!
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Offline Mastermind

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Re: Dolmar 7900 Porting Info
« Reply #106 on: July 03, 2014, 10:57:46 am »
Cool.

With the 6400 the port timing numbers that make a strong runner are way different than the 7900. With a closed port jug......those numbers will likely be more in line with the 7900.

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Offline KilliansRedLeo

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Re: Dolmar 7900 Porting Info
« Reply #107 on: July 03, 2014, 11:10:17 am »
IIRC the 665 uses a 47 or 48mm piston, so lots of room to use wider skirt pistons. Shep mentioned that the stock ports on the 665 were quite small compared to the 675/681 saws, so there may be lots of room to play!
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Offline Cut4fun .

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Re: Dolmar 7900 Porting Info
« Reply #108 on: July 03, 2014, 11:14:03 am »
Did  Shep send that 665 P+C to you too?  Like to see some pics of that inside too.
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Re: Dolmar 7900 Porting Info
« Reply #109 on: July 03, 2014, 11:16:40 am »
Wider than stock ports aren't as important in a worksaw as having the timing numbers dead on.

The MS661 I was not happy with was only 3° different on one port, than the one that I was very happy with......yeah, it matters that much.
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