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Finally it’s time Baby gets a new top end. I think I’ll be sending the heads and cylinders off to Hammer Performance in Idaho. Going with .020 over, forged 9.5 : 1 pistons.
I ran her for 95,000+ miles with the head breather routed back through the air box… Lots of crud on top of the pistons.
Finally it’s time Baby gets a new top end. I think I’ll be sending the heads and cylinders off to Hammer Performance in Idaho. Going with .020 over, forged 9.5 : 1 pistons.
I ran her for 95,000+ miles with the head breather routed back through the air box… Lots of crud on top of the pistons.
So why the tear down? Just because?
And that’s not unique to Harley engines and really doesn’t mean much. The “crud”.
Post up when rebuilt and what you think of the performance. Pics too!
Why the tear down? She’s using a bit of oil and has lost some of her pep when I roll on the throttle. I’m told I get a puff of smoke from the exhaust at times.
Also, I figure if I rebuild her now, I can ride trouble free for the rest of my life.
I’m looking into rebuilding the swing arm too.
I would rethink the forged pistons. Forged pistons are more for racing where there is no "Break In" before running. I have always liked / used cast pistons on the street. See what others think?
ETA: I don't think the internals look too bad, especially considering that mileage.
I would rethink the forged pistons. Forged pistons are more for racing where there is no "Break In" before running. I have always liked / used cast pistons on the street. See what others think?
ETA: I don't think the internals look too bad, especially considering that mileage.
Exactly, looks like what 100k plus motor usually looks like.
Concur with the expense. Just go with what works since it’s not a high performance rebuild.
I can’t raise the compression without going to forged pistons, but maybe that’s a mistake !?
I honestly don’t really know what I should do,
on the one hand I , like most folks, would enjoy more power. I also value the smoothness and quietness of the stock EVO w/ the EV13 cam I’ve ridden for 27 years.
Last edited by GOGOBECK; Nov 18, 2023 at 07:57 AM.
MLS Cometic .030 head gaskets and the .010 cometic base gaskets give the engine .5 more compression about 8HP using a stock cam and then use a replacement cam its more
At 101,000 miles, I rebuilt the engine in my '94 FLHTCU; getting the pistons out of the bores was not easy. You pretty much couldn't see the valve reliefs. I kept is basically stock with Wiseco pistons and an EV 27 cam. Very nice difference, and a fun project.
MLS Cometic .030 head gaskets and the .010 cometic base gaskets give the engine .5 more compression about 8HP using a stock cam and then use a replacement cam its more
Thanks for the input, I’ll look into this.
Originally Posted by Uncle Peepers
At 101,000 miles, I rebuilt the engine in my '94 FLHTCU; getting the pistons out of the bores was not easy. You pretty much couldn't see the valve reliefs. I kept is basically stock with Wiseco pistons and an EV 27 cam. Very nice difference, and a fun project.
The pistons slipped outta the bores easy enough, I thought the wrist pins would just slide out, but I had to use a drift and tap ‘em… that surprised me.
What does 108,000 miles look like on the inside!
