Stroking a Dolmar 7900

[Fruecrue]

Randy has had that saw apart about two years. It's not back together. LOL

Randy is a slacker, and has the vapors.

 

[RI Chevy]

He is too busy protecting his farm animals from guys. LMAO

 

[Fruecrue]

He is too busy protecting his farm animals from guys. LMAO

Careful in here Jeff, wouldn’t want you to get burned. These here Dolmars are addicting.

 

[Mastermind]

He is too busy protecting his farm animals from guys. LMAO

Oh Jeff......this is Dolmar country !!!!

 

[RI Chevy]

Hmmm. I'm open minded kinda sorta. Lol

 

[Deets066]

Hmmm. I'm open minded kinda sorta. Lol

 

[RI Chevy]

You missed the kinda sorta Deeter. LMAO

 

[Deets066]

You missed the kinda sorta Deeter. LMAO

I didn’t
Kinda sorta... not even a little bit. Lol

 

[RI Chevy]

Lol
I like German saws.

 

[huskyboy]

Lol
I like German saws.

Squeel casts some of the cases for dolkita I believe

 

[RI Chevy]

They must be good then. [emoji12]

 

[Woodpecker]

Oh Jeff......this is Dolmar country !!!!

I'm open minded

Friends don't let friends get hooked on dolkitas!



C'mon Jeff you know you wanna ...

 

[Deets066]

Lol
I like German saws.

Dolmar is right up your alley then

 

[Fruecrue]

Ain’t she a beaut Clark?

 

[Fruecrue]

Lobes swing about .027” further than the dolmar crank.
When time allows, the cases will get clearanced .030” and I will assemble the bottom end with new Nachi bearings and leave the seals out temporarily.
Goal being to find a way to run this crank without machining.

No balls, no babies!

 

[Terry Syd]

When this crank swap is completed, is the saw going to be ported? I'll be interested to see if the transfers are raised - (think about it).

 

[hseII]

Lobes swing about .027” further than the dolmar crank.
When time allows, the cases will get clearanced .030” and I will assemble the bottom end with new Nachi bearings and leave the seals out temporarily.
Goal being to find a way to run this crank without machining.

No balls, no babies!

Well you have proven that to not be your problem.


Sent from my iPhone using Jon1212 Pro

 

[Fruecrue]

When this crank swap is completed, is the saw going to be ported? I'll be interested to see if the transfers are raised - (think about it).

It will be.
An interesting saw for sure. I’m thinking she’ll run a high exhaust with 28 degrees BD.
Interested in your thoughts.

 

[Terry Syd]

The 'induction stroke' for a two-stroke is from transfer closing to TDC. When you raise the transfer height, you reduce the induction stroke. (you can get the same time/area by widening the transfers without reducing the induction stroke)

It would be interesting to see what a stock 7900 performs like when the crankcase is machined out to give an extra .30" of clearance. The added crankcase volume will reduce the crankcase compression and broadened the powerband.

 

[huskyboy]

But the crank will be taking up that space that is machined out right?