Who makes pistons for a briggs 35?

Other than Briggs.



Thanks

Arias makes the forged flat top pistons that Performance V-Twin sales. I don't believe you can buy these direct from Arias. Probably have to contact Performance V-Twin or possibly a BPS Dealer. These pistons have a raised compression height and require the longer Eagle rods.

I run a set in my motor and I've had several PM's inquiring info. regarding them so here it is.

Arias- Phone # 310-532-9737
Part # 401116
Recommended piston to cylinder clr. .0035
Piston O.D. 3.3625
Stock Bore I.D. 3.366
Wrist pin O.D. .827 (21mm)
Wrist pin clr. .0007

wiseco

Je Piston will make you a piston. You just have to buy four pistons and they will do what ever you what on compression and gas porting the pistons

Cheaper to buy je pistons from evt. If arias raised the compression height then you should only need stock length rods.

Wait -- no piston ever REQUIRES a longer rod that I know of

Only time you will need a longer rod is when you raise the wrist pin to bring the piston deck down but move the piston up further in the hole.

OK --- so that makes sense


But what dosent make sense is WHY you would move to wrist pin up and put a longer rod --- wouldnt the piston still be in the same place?

ive been told that longer rods make more torque on car motors think it would be the same on these

u can build a sb chevy w short or long rods same stroke

All you change is the compression ratio with rod length.

different pistons for each compression stays the same

Compression height is the distance between the center line of the wrist pin bore to the top of the piston. I don't remember the exact length because it was over a year ago when I measured my Eagle rods, but I'm thinking they were .120 longer than stock B&S rods. The Arias pistons have a compression height designed for the longer rod. If you ran a stock rod with these Arias pistons, the piston would be down in the cylinder at TDC. This would hurt your compression ratio.

A longer rod dwells at TDC for a longer period. The theory is a longer cleaner burn. A lot of old timers started running 6" rods in 350 small block chevy's instead of the stock length 5.7" rod. It's still popular today. The key is to have a piston designed for the longer rod. Otherwise you would have .300 of piston sticking out of the cylinder at TDC.

Compression height is : (Stroke divided by 2) (plus rod length) (minus deck height)

Example : (3.480 divided by 2)= 1.740 (1.740 plus 5.700)= 7.440 (7.440 minus 9.000)= 1.560

A 350 small block chevy with a stock length 5.700 rod has a compression height of 1.560.

Most engine builders, building engines with power adders (Nitrous, Turbo and/or Super chargers) will run a shorter rod and/or less stroke. This allows for a larger compression height and gives the piston manufacture more material between the wrist pin to the top of the piston for thicker/stronger ring lands.

you phags need to focus on building a better base...
the rest will follow.

btw: poo poo duck, u mite wanna reconsider dem push rods!

So if I'm understanding it right the wrist pin will be higher just not .120?

What about where to find after market/over size rings ? I need a set.

That is why a 31hp crank with 3.5" pistons is a monster. Short stroke and long rod. That motor will spin 5600 plus. My gen has same stroke but a 1" shorter rod, makes gobs of power to 4700 but can't get over that hump.

Preston I was sitting here scratching my head wandering the same thing, But once I re-read it and looked at the Dwg 50hptiller put up, I got it.

After all that I can say I learned somerhing new. Longer rods are not always for booting compression.

Well all I got to say is Im glad I asked that. I learned a lot and now will be spending MORE money when I do decide to build my engine LOL

been a long tiem since i lernt somthing on MMT!

bout time we had a good post!

Comparison Pics:

Stock vs Shaved BPS Pistons:


C-rod comparison angle and length- BPS .120 over vs Stock:

Good thread, Subscribed

Ditto