Im building several OMC 31.8s- 25/35 hp- deflecter pistons. Ive used stock & Wiseco pistons before, the Wisecos seem to be lighter but run about the same. What are [if any] other choices ? Any opinions on the best performance brand? Thanks, Mike.
Im building several OMC 31.8s- 25/35 hp- deflecter pistons. Ive used stock & Wiseco pistons before, the Wisecos seem to be lighter but run about the same. What are [if any] other choices ? Any opinions on the best performance brand? Thanks, Mike.
120 looks & no answers, Oh well. I did find out something of interest for anyone boring a 31.8 out, mines 0.030 oversize. It broke & ingested a reed petal so it had to come apart. Its been run about 25 hrs, mostly WOT.
The cyl sleeves stop about 9/16" short of the bottom of the exhaust side of the casting. [they reach the bottom of the intake side]. From being bored the steel of the sleeve was cut to be flush with the aluminum of the block. This is scratched up as well as about the bottom 1/2" of that side of the piston. Ill have to get in there & clearance that a bit I guess. Something I shouldve seen & addressed then but at least I get a 2nd chance now.
There is a new brand that just got approved by APBA for OMC A motors, not sure of brand, but, the general consensus was that they were better, and, they were cast not forged like Wisco.
Sorry not to be of any more help....
The Pistons (class A OMC) in question are made by GLM. Part number 24430 (for .030 over). This kit includes the piston, rings, wrist pin and keepers. Replacement rings are part number 23730 (2 per set). I sell the piston kits to racers for $45.00 (list $58.00) and the ring sets for $19.00 (list 31.00). They make a full range of cast pistons for OMC and Mercury outboards. Freight is normally just a few dollars.
Hope this helps,
Ken Scoville
www.boatwrx.com
Boulder, CO
303-440-0854
We actually made high ringers for those if you can find them
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