Briggs Piston

[briggsraptor]

I am just curious, I see on e-bay people selling pistons that say will fit 3.5 or 5 hp. engines, I always thought the 5hp piston was a monster compared to their smaller engines. Hence people use the 5hp. for racing. Am I correct in assuming they are full of :censure: here. Please advise......

 

[MoTo-BunnY]

Unless they are selling different sizes of pistons, no there isn't any way one piston will fit that range of engines, lol. :laugh: (UNLESS it was made of that crazy liquid metal the Terminator in T2 was made from?

From paperwork in front of me I see that a 2HP Briggs is 2 3/8" bore, the 5HP is 2 9/16" bore, the bigger block 6HP is 2 3/4" and the 8HP is 3". Not as much of a difference than you might think....

The stroke of a 2HP is 1 1/2", the 5HP is 2 7/16", the 6HP is 2 3/8" (less than the 5HP!), the 8HP is 2 3/4", so greater spread there actually...



On a side note, I just parted out a small chain saw the other day and kept the cute widdle piston, just 1 1/2" bore!

 

[Richard Trotter]

My aftermarket parts catalog shows the 3,5hp and the 5hp have the same part # for the piston. The bores are the same too.

 

[creia]

Am I correct in assuming they are full of :censure: here. Please advise......

Yes, they are full of:001_9898: The 3 HP and 5 HP are different pistons.
Michael

 

[creia]

My aftermarket parts catalog shows the 3,5hp and the 5hp have the same part # for the piston. The bores are the same too.

Richard,
I would not recommend ordering any parts from that catalog!:laugh:
The pistons and bores for a Briggs 3Hp and 5 HP are different.
Michael

 

[125ccCrazy]

Richard,
I would not recommend ordering any parts from that catalog!:laugh:
The pistons and bores for a Briggs 3Hp and 5 HP are different.
Michael

not 3hp...3.5hp (3 1/2) is the same bore as a 5hp but shorter stroke..

 

[creia]

not 3hp...3.5hp (3 1/2) is the same bore as a 5hp but shorter stroke..

100% agreed. My reply was to the OP that had originally included 3 HP in his question and has since modified his post and deleted the 3 HP.
Michael

 

[briggsraptor]

:shrug: Sorry for the confusion guys
In my business they call that a typo :thumbsup:

 

[MoTo-BunnY]

Yeah, it wasn't 3.5HP when I first answered and it looked like it was stating a range (3-5HP)? :shrug: no biggie, just clarifying.....


The 5HP Briggs is an interesting engine as it is almost a "square engine" at .951 regarding the bore/stroke ratios and thus a nice compromise between RPM/HP and Torque. They will both rev pretty high AND pull a load. :thumbsup: