Echo 7310 build thread

[GoBigBlue1984]

I’ll go into more detail on the porting side of things tomorrow. As far as exhaust goes.....The plan for now is to trim back the factory deflector and open it up as much as it will allow. Then tack it back down.

I’ll raise exhaust to 104-105. Primary’s to open at 118/119 and secondaries to open right behind them. Squish is .019-.020 currently.

 

[Kiwioilboiler]

subbed for learning.

 

[markds2]

subbed for learning.

Same here Adz, the 6 transfer ports intrigue me.

 

[Deets066]

Exhaust port gunna be huge, how close is it to the primary’s? Chance of short circuit?

 

[Redfin]

51x36
Unlimited I believe

Surprising.

 

[GoBigBlue1984]

Exhaust port gunna be huge, how close is it to the primary’s? Chance of short circuit?

Exhaust opening won’t be too bad Deeter. But you are correct on the primaries. They are closer than “normal” and short circuiting may very well bite me in the balls. Perhaps I’ll need less time....

 

[GoBigBlue1984]

I’ve got (12) of these to make today for a factory here in town.


Good job to get programmed and let it run for a bit. Will give me some time open up this muffler....

 

[GoBigBlue1984]

I’ll put this in the mill and use a 4 flute 1/4” carbide end mill and everywhere you see sharpie....will be removed.

 

[GoBigBlue1984]

When I asked the Hurco rep if they could fit a 4 jaw onto my TM10, he looked at me like I had 4 heads. This isn’t a production shop and I don’t typically care for 3 jaw chucks. But this hydraulic chuck is surprisingly rigid and accurate. Going on 3 years with it.



I may or may not have “skimmed” the jaws a time or two......

 

[Red97]

I’ll go into more detail on the porting side of things tomorrow. As far as exhaust goes.....The plan for now is to trim back the factory deflector and open it up as much as it will allow. Then tack it back down.

I’ll raise exhaust to 104-105. Primary’s to open at 118/119 and secondaries to open right behind them. Squish is .019-.020 currently.

Be careful..

The intake/exhaust port tunnels do not have a ton of meat to them.

Just watch the wall thickness if you are trying to get the most area on the exhaust.

With the transfers that is a ton of volume holding fuel at low rpm, if they are all open at the same time it can give some low/idle issues.

 

[NightRogue]

51mm bore eh
Closest swap option should be 372 xpw at 51.4mm
Nicely done Brett, keep em coming

 

[GoBigBlue1984]

Be careful..

The intake/exhaust port tunnels do not have a ton of meat to them.

Just watch the wall thickness if you are trying to get the most area on the exhaust.

With the transfers that is a ton of volume holding fuel at low rpm, if they are all open at the same time it can give some low/idle issues.

I love it Joe! Great info. This is what’s so cool about build threads. You, Deeter and Kev giving some food for thought

 

[Deets066]

I may or may not have “skimmed” the jaws a time or two......

 

[GoBigBlue1984]

 

[Redfin]

Perhaps I’ll need less time....

Bite your tongue.

 

[Red97]

Oh...

Not a horrible idea to fill the transfer caps with epoxy... I've seen a few go through those caps raising them.

 

[Definitive Dave]

3 new pistons from 2 manufacturers currently in development

If guys need OEM cylinder kits or mufflers, let me know, I am also working on getting carbs to modify.

 

[Deets066]

3 new pistons from 2 manufacturers currently in development

If guys need OEM cylinder kits or mufflers, let me know, I am also working on getting carbs to modify.

Davey is on top of it.

 

[Deets066]

Oh...

Not a horrible idea to fill the transfer caps with epoxy... I've seen a few go through those caps raising them.

How does case volume look?

 

[Red97]

How does case volume look?

Not had mine apart yet.