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Author Topic: Dolmar 7900 Porting Info  (Read 7816 times)

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Offline mdavlee .

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Re: Dolmar 7900 Porting Info
« Reply #190 on: October 06, 2014, 05:44:03 pm »
I'll try to throw the new top end on the other one I'm doing the swap on tonight. I have my stock one to use as a baseline.

The exhaust is stepped because of the slr muffler. It goes all th

e way into the step. I may use it as a anti reversion step instead of blending it all the way in.

The ports look the same size. If I had dilly putty I could mold them.
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Offline mdavlee .

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Re: Dolmar 7900 Porting Info
« Reply #191 on: October 06, 2014, 06:27:11 pm »
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Offline aclarke

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Re: Dolmar 7900 Porting Info
« Reply #192 on: October 06, 2014, 09:11:15 pm »
Looks good, sounds crisp!!
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Offline mdavlee .

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Re: Dolmar 7900 Porting Info
« Reply #193 on: October 06, 2014, 09:15:31 pm »
Thanks. It's blowing 170 lbs right now on tank 1.
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Offline srcarr52

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Re: Dolmar 7900 Porting Info
« Reply #194 on: October 07, 2014, 10:35:39 am »
Quote from: Gatekeeper on October 06, 2014, 09:15:31 pm
Thanks. It's blowing 170 lbs right now on tank 1.

That's where mine ended up. 
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Offline mdavlee .

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Re: Dolmar 7900 Porting Info
« Reply #195 on: October 07, 2014, 10:43:07 am »
Quote from: srcarr52 on October 07, 2014, 10:35:39 am
That's where mine ended up. 

I think that's about right for a working saw. I have used some that had more but they sometimes get a little hot in long bucking cuts.
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Offline srcarr52

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Re: Dolmar 7900 Porting Info
« Reply #196 on: October 07, 2014, 11:48:05 am »
Quote from: Gatekeeper on October 07, 2014, 10:43:07 am
Quote from: srcarr52 on October 07, 2014, 10:35:39 am
That's where mine ended up. 

I think that's about right for a working saw. I have used some that had more but they sometimes get a little hot in long bucking cuts.

I have had 288's and 394/5's that had over 200 psi and I used them to mill with but the 7900 may be a different animal.
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Offline 660magnum

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Re: Dolmar 7900 Porting Info
« Reply #197 on: October 07, 2014, 12:09:43 pm »
I have a year 2006 7900 with 180 #. I bought it used and it is stock as far as I can tell. It appeared to be a commercially used saw when I got it. (Beat up).

I've since replaced all the damaged parts and updated all components to the 2010 era 7900's. I haven't bothered the P&C. It has always run nice for me and doesn't get hot. 
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Offline mdavlee .

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Re: Dolmar 7900 Porting Info
« Reply #198 on: October 07, 2014, 03:49:17 pm »
Quote from: srcarr52 on October 07, 2014, 11:48:05 am
I have had 288's and 394/5's that had over 200 psi and I used them to mill with but the 7900 may be a different animal.

I've had one high compression saw keep going on me. I had to push in the decomp and hold it in to finally kill it. The ignition did nothing. I'm a little gun shy of 200+ lb work saws.
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Offline EHP

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Re: Dolmar 7900 Porting Info
« Reply #199 on: October 16, 2014, 08:29:29 pm »
I'm just guessing but think that 7900 was a 7900 Jerod sold him quite a few years ago like I'm guessing but 10 or more years ago and I'm thinking Jerod ran the saw for a while first , I built a bunch of those 7900's like that saw and they are not cookie cutters , they are true worksaws and were never meant be be hot in power . Jerod was sending 7900's to Javilin so he wanted very good long lasting motors which they were , I cannot remember how many 7900's I built for them but do remember having pickup truck full of saws on each trip he made north to me . The 7900 can be made quite abit hotter than how those saws ran
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