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| 35 HP pistons? http://mudmotortalk.com/mmt_v2/viewtopic.php?f=3&t=17681 |
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| Author: | Pacer [ Tue Apr 12, 2011 8:24 am ] |
| Post subject: | 35 HP pistons? |
Who makes pistons for a briggs 35? Other than Briggs. Thanks |
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| Author: | po po mud duck [ Tue Apr 12, 2011 8:32 am ] |
| Post subject: | Re: 35 HP pistons? |
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 |
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| Author: | cb5331 [ Tue Apr 12, 2011 8:53 am ] |
| Post subject: | Re: 35 HP pistons? |
wiseco |
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| Author: | jeremyhit [ Tue Apr 12, 2011 6:36 pm ] |
| Post subject: | Re: 35 HP pistons? |
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 |
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| Author: | drake1 [ Tue Apr 12, 2011 6:47 pm ] |
| Post subject: | Re: 35 HP pistons? |
Cheaper to buy je pistons from evt. If arias raised the compression height then you should only need stock length rods. |
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| Author: | BradS [ Tue Apr 12, 2011 6:51 pm ] |
| Post subject: | Re: 35 HP pistons? |
Wait -- no piston ever REQUIRES a longer rod that I know of |
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| Author: | drake1 [ Tue Apr 12, 2011 6:57 pm ] |
| Post subject: | Re: 35 HP pistons? |
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. |
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| Author: | BradS [ Tue Apr 12, 2011 6:58 pm ] |
| Post subject: | Re: 35 HP pistons? |
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? |
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| Author: | riverratdm84 [ Tue Apr 12, 2011 7:31 pm ] |
| Post subject: | Re: 35 HP pistons? |
ive been told that longer rods make more torque on car motors think it would be the same on these |
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| Author: | Matt [ Tue Apr 12, 2011 7:35 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | riverratdm84 [ Tue Apr 12, 2011 7:43 pm ] |
| Post subject: | Re: 35 HP pistons? |
u can build a sb chevy w short or long rods same stroke |
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| Author: | Matt [ Tue Apr 12, 2011 7:50 pm ] |
| Post subject: | Re: 35 HP pistons? |
All you change is the compression ratio with rod length. |
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| Author: | riverratdm84 [ Tue Apr 12, 2011 7:59 pm ] |
| Post subject: | Re: 35 HP pistons? |
different pistons for each compression stays the same |
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| Author: | po po mud duck [ Tue Apr 12, 2011 8:58 pm ] |
| Post subject: | Re: 35 HP pistons? |
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. |
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| Author: | coondik [ Tue Apr 12, 2011 9:04 pm ] |
| Post subject: | Re: 35 HP pistons? |
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! |
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| Author: | po po mud duck [ Tue Apr 12, 2011 9:37 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | po po mud duck [ Tue Apr 12, 2011 9:44 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | bayouboy [ Tue Apr 12, 2011 9:52 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | bayouboy [ Tue Apr 12, 2011 9:59 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | bayouboy [ Tue Apr 12, 2011 10:01 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | bayouboy [ Tue Apr 12, 2011 10:19 pm ] |
| Post subject: | Re: 35 HP pistons? |
So if I'm understanding it right the wrist pin will be higher just not .120? |
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| Author: | bayouboy [ Wed Apr 13, 2011 3:27 am ] |
| Post subject: | Re: 35 HP pistons? |
What about where to find after market/over size rings ? I need a set. |
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| Author: | po po mud duck [ Wed Apr 13, 2011 3:38 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | po po mud duck [ Wed Apr 13, 2011 4:10 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | drake1 [ Wed Apr 13, 2011 5:10 pm ] |
| Post subject: | Re: 35 HP pistons? |
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. |
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| Author: | bayouboy [ Wed Apr 13, 2011 6:39 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | po po mud duck [ Wed Apr 13, 2011 7:08 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | bayouboy [ Wed Apr 13, 2011 7:15 pm ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | MaXXis85 [ Thu Apr 14, 2011 6:41 am ] |
| Post subject: | Re: 35 HP pistons? |
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. |
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| Author: | muddiejeep [ Thu Apr 14, 2011 6:44 am ] |
| Post subject: | Re: 35 HP pistons? |
| Author: | BradS [ Thu Apr 14, 2011 7:58 am ] |
| Post subject: | Re: 35 HP pistons? |
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 |
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| Author: | Brinkleydog [ Thu Apr 14, 2011 8:30 am ] |
| Post subject: | Re: 35 HP pistons? |
been a long tiem since i lernt somthing on MMT! bout time we had a good post! |
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| Author: | deadbird8 [ Thu Apr 21, 2011 5:25 am ] |
| Post subject: | Re: 35 HP pistons? |
Comparison Pics: Stock vs Shaved BPS Pistons: C-rod comparison angle and length- BPS .120 over vs Stock: |
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| Author: | take'emgator [ Thu Apr 21, 2011 6:36 am ] |
| Post subject: | Re: 35 HP pistons? |
Good thread, Subscribed |
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| Author: | SP [ Mon Mar 05, 2012 12:55 pm ] |
| Post subject: | Re: 35 HP pistons? |
Ditto |
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