piston ? cam suggestion
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Tourer
Joined: Mar 2011
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From: Emory,TX
piston ? cam suggestion
I bought this bike a few years ago from an overflow dealer. He told me it had a big bore kit, some type of aftermarket cam and an aftermarket carb with a Thunderjet kit (turns out it is just a Mikuni 42HSR that was badly tuned). I installed a Fueling oil pump a couple years ago and found an Andrews 37B cam, based on the cam size I assumed it had the SE 9.5:1 big bore kit. Well, I tore it down last night to install a set of 06 heads that I picked up and discovered the pop-up piston. From what I can tell it is the SE 10.25:1 kit, but cant find a good picture of one and there are no numbers on top of the piston itself. If anybody recognizes the piston design please chime in. It also had .045 graphite head gaskets (I hate those fvcking things). That should have put the compression right at 10:1. After pulling the heads off it looks they have been ported, but cant find a good picture of a stock port (haven't had time to cleanup/inspect the exhaust side yet). Can anyone confirm port work ? I have wanted to install a bigger cam but have held off because I thought the C/R was lower than what it was. I think the C/R is too much for the 37B cam. I plan on using a .030 gasket so that should bring the C/R up around 10.33:1. So, without all that info, could I run an S&S 570, SE 258 or maybe a Fueling 574 Reaper cam with the new C/R ? I would appreciate any info/advice you have. Thanks
P.S. Sorry for the long winded post
P.S. Sorry for the long winded post
Seasoned HDF Member
Joined: Mar 2010
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From: Poolville
It's possible that those are 10:1 pistons. The dome size is similar to my wiseco 10:1 with a 6.5 cc dome. I see that you have the head torqued down, what base gasket thickness do you have and what is the piston to deck clearance? Also you definitely are gonna need to cc the heads. I would not pick a cam until you know what static compression you have so that you can pick the right cam or talk to someone who can recommend a cam and yes it does look as if some one did the heads. attach pic's of the combustion chamber and maybe some one will be able to clarify valve sizes...
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From: san antonio
Road Master
Joined: Aug 2012
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From: CT
Those are not se 10.25s. You might want to pull the jugs and pistons for a better shot at identifying them. A ccp test before disassembly would have been a good idea to see where you're at, but you can have the heads and pistons cc'd. The heads look like they've been cleaned up, but doesn't look like any material has been removed. Could you measure the valves or get a good pic of the combustion chamber?
Really?? That's not even 200ccp, I wouldn't hesitate to run that in a 95" softail with an ignition.
Really?? That's not even 200ccp, I wouldn't hesitate to run that in a 95" softail with an ignition.
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Tourer
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From: Emory,TX
Last time I checked ccp it was right at 189 psi. Curiosity got he best of me, I went ahead and took the pistons out. They are SE-22863/22862 made by Arias, part 9826HI. The 06 heads cc'd right at 85.5. I'm not sure what the old heads were, but I'm starting to think they are stock. I have a DTT programmable ignition system on there now. Thanks everyone for the replies.
Last edited by jetmech74; Jan 31, 2015 at 09:08 PM.
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Tourer
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From: Emory,TX
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Tourer
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From: Emory,TX
The valves are stock, at least size wise. I can get a pic of the comb chamber but it's gonna take me a while to cleanup.
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Joined: Jun 2006
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From: san antonio
Last time I checked ccp it was right at 189 psi. Curiosity got he best of me, I went ahead and took the pistons out. They are SE-22863/22862 made by Arias, part 9826HI. The 06 heads cc'd right at 85.5. I'm not sure what the old heads were, but I'm starting to think they are stock. I have a DTT programmable ignition system on there now. Thanks everyone for the replies.
Last edited by djl; Jan 31, 2015 at 09:49 PM.