Stroking a Dolmar 7900

[Deets066]

I looked at these, gimic or decent?

http://www.microbluebearings.com/products/6203-Steel-Ball-Bearing.html

Those are good bearings

 

[T.Roller]

Those are good bearings

They should be lol

 

[Fruecrue]

They should be lol

Sup Dave.

Dave gifted me the coil for this build.
Thank you.

Got it and the flywheel mounted, ready to rock.
Just need a couple more parts to show up and some time to finish up.

 

[Mastermind]

Sup Dave.

Dave gifted me the coil for this build.
Thank you.

Got it and the flywheel mounted, ready to rock.
Just need a couple more parts to show up and some time to finish up.

David is a suckass.

Err I mean.....is a good dude.

 

[Deets066]

Sup Dave.

Dave gifted me the coil for this build.
Thank you.

Got it and the flywheel mounted, ready to rock.
Just need a couple more parts to show up and some time to finish up.

Which coil did you go with?

 

[Fruecrue]

Which coil did you go with?

It’s the 12,8 coil off his 7910

 

[Fruecrue]

I’ve already converted my 7910 to an unlimited husky coil. This saw will probably get the same treatment.

 

[drf256]

1mm of total travel isn’t enough to matter.
Some guys take much more out on certain saws on a standard build.

Remember, you now have a longer stroke. So the distance of a 100* exhaust roof is greater than that of the standard crank.

So, you’ll have more volume to compress into the same chamber size at the same timing numbers.

You may want to see what a stock Dolmar 7900 is for compression, what it’s comp is at ideal squish, and figure out your game plan from there.

If you want an amount removed from the crown, ship it down.

 

[Fruecrue]

Remember, you now have a longer stroke. So the distance of a 100* exhaust roof is greater than that of the standard crank.

So, you’ll have more volume to compress into the same chamber size at the same timing numbers.

You may want to see what a stock Dolmar 7900 is for compression, what it’s comp is at ideal squish, and figure out your game plan from there.

If you want an amount removed from the crown, ship it down.

Thanks Al.

 

[T.Roller]

Sup Dave.

Dave gifted me the coil for this build.
Thank you.

Got it and the flywheel mounted, ready to rock.
Just need a couple more parts to show up and some time to finish up.

What's going on Dave. You are very welcome.

 

[T.Roller]

David is a suckass.

Err I mean.....is a good dude.

Hey gfy

 

[drf256]

Hey gfy

GFY Dave2

How’s things?

 

[T.Roller]

GFY Dave2

How’s things?

Fantastic Al how about things up your way?

 

[drf256]

Fantastic Al how about things up your way?

Busy,but all ok.

Happy TG to you and the Fam.

 

[T.Roller]

Busy,but all ok.

Happy TG to you and the Fam.

I hope you and your family have a great Thanksgiving.

 

[mdavlee]

Best I remember with about .020-.025” o of the chamber with exhaust at about 96 it still has 200 lbs of compression

 

[Fruecrue]

Best I remember with about .020-.025” o of the chamber with exhaust at about 96 it still has 200 lbs of compression

I like those numbers.

 

[mdavlee]

I like those numbers.

Piston choice didn’t matter much in that either.

 

[Fruecrue]

Waitin’ on parts again....

 

[mettee]

This is gonna be rad!


What are you waiting on