Dolmar 64xx/73xx/79xx series, smurfs and solo 665/675/681 thread

[mettee]

Anyone ever port on the case?

 

[Wilhelm]

Anyone ever port on the case?

As in not take the cylinder of the case for port work?

One individual comes to mind. . . , as far as I understand many of his builds required extensive repairs once they failed and they seemed to fail prematurely compared to builds by other builders.

There is no justification for performing a cylinder port job while the same is still assembled to the case.

NO, I am not a builder, it is just my humble observation.

 

[huskyboy]

If you mean grind on the cutouts in the case, I think that would just increase case capacity which might actually hurt these saws?

 

[mettee]

I'm just wondering...

Once mdavlee said put the piston in there at bdc it made me think.

The piston goes way down there and almost touches the case, I'll get a pic of a clay imprint later and post it.

The one area has a bump in the corner that looks to block one port. I'm sure there is a screw around that so it is likely NOT possible to reduce that restriction.

I didn't not mean port the cylinder on the case

 

[Johnmn]

So what's the consensus on the HD filter set up on these? Waste of time/ loss of power? Some say yay some say nay

 

[huskyboy]

So what's the consensus on the HD filter set up on these? Waste of time/ loss of power? Some say yay some say nay

I think @mdavlee has a video comparing the two.

 

[bigbadbob]

https://healthycanadians.gc.ca/recall-alert-rappel-avis/hc-sc/2018/67192r-eng.php

 

[Backtroller]

Mike might still have the videos. It was a 7910 he ported for me. I sold the HD set up and bought the highest flowing mesh filter for it. He built me a strong saw for sure.

 

[huskyboy]

The low top isn’t terrible with the neck greased. Actually stays clean for a pretty long time for me. I could see the hd being better for extreme conditions despite it not flowing as good?

 

[mdavlee]

HD set up was choking it so bad I thought something was wrong. It filters awesome. If longevity is the main goal use it. If not use the low top.

 

[huskyboy]

There are small rubber flaps in bottom of the air box that open at idle vacuum to let chips out at idle I noticed. They close under full throttle. Pretty cool feature.

 

[mettee]

Thats why you do this

 

[huskyboy]

Thats why you do this

Maybe you can experiment and do timed cuts with that filter vs the oem one to see if it’s the filter or neck that is restrictive?

 

[mettee]

I can do that no problem.

I did some more work on my lower transfers today.

Gonna do the squish and base soon.

 

[Backtroller]

Thats why you do this

That’s nice but I want everything under the covers. I want people to scratch their heads when they see it run.

 

[mettee]

That’s nice but I want everything under the covers. I want people to scratch their heads when they see it run.

It fits under the covers

 

[mettee]

The stock metal spring that holds the HD filter down will hold this part down. Then the filter will secure with the hose clamp.

This

 

[Backtroller]

Maybe you’ve posted but I missed it, which elbow are you running?

 

[mettee]

Just need to cut the base and squish. Then I can do the rest of the port timing. I am cutting the base after porting the lower transfers so any of the little marks I made will be removed.

Trying to make it look halfway professional

 

[mettee]

Maybe you’ve posted but I missed it, which elbow are you running?

HD filter elbow and boot. I have an addition to the velocity stack, I'm going to run two versions and see if anything is different.