Author Topic: Dolmar 7900 Porting Info  (Read 8744 times)

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Offline EHP

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Re: Dolmar 7900 Porting Info
« Reply #20 on: January 07, 2012, 12:56:31 pm »
I guess like I said it depends on the gauge , I have not see much of the newest strato stuff as most guys here are staying away from that , if you got 190 psi on my gauge and is running on pump gas then it has low porting and in most cases a large blow down time . I had 2-288's come in here last summer that were stock but they pulled the base gasket  and in real nice shape but were in the 180 psi, in 16 inch maple they were fine but in the bigger 40 inch plus stuff they would lay down in the cut bad, good thing the guys running them knew to stop and see what was wrong , I just lowered the compression to 170 psi and they said they worked great , Now mostly I blame this on our great gas we are getting now and if you have better gas then you most likely will not see these problems but believe me the more ethanol you get the worse this problem is going to get and another big problem coming is alot of 2 stroke oils will not mix with ethanol and the ones that do cost lots of money and hard to get in some areas . I know when guys from NY come up and play with their saws they have to richen them up to run our high test pump gas which tells me ours has more ethanol in it

 

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