Anybody know where to get the best deal on SE ACR heads?

 

Okay got off the phone with a local head guy. We are going to do the ACRs, and what he calls a stage one port and polish to my heads.

 

If I recall correctly, there's been a couple of guys with stock 96 bikes that tried the 555, then went back to the 255. Maybe a couple with the 103 bikes, as well. Set up the 555 correctly, (10 to 10.2 compression), and they would have been much happier. A stock 96 at about 9.2 compression needs something a little shorter, with earlier valve timing.

If you're changing pistons and jugs, you're not tied into the stock compression, and by bumping up your compression a bit, you open the door to a bunch of cams that will really wake your bike up.

 

So was the push rod itself rubbing against the tube? If so where on the tube? at the top going into the rocker box?

 

I have to measure to figure out the exact spot. It's about 3" from the top of the pushrod. You can see it clear as day.

 

Well I'm going with the 103 10:1 CR pistons. You really think it will do as good as a 255 with low end grunt?

 

I bought my SG new with the 103 kit in it. The tuner at the dealer had never tuned a tbw bike before and he couldn't get it right.

I took it to another dealer about 90 miles away who had a builder with a great reputation. I wanted the tune and asked him what else I could do without spending a huge amount of money.

He suggested SE heads and forged, domed, 10.5:1 pistons. He didn't think the 255 cams would work out very well, but said we could try it and go into the bottem end later if I wasn't happy.

It turned out great. With manual cr's and the SE compensator sprocket, and heavy duty starter, I don't have any hard start issues anymore. I have ridden this build about 18,000 miles so far.

The low end is great. I cruise at 2,800 to 3,000 rpms and I don't have to downshift to pass most anything I roll up on. Open the throttle at that rpm in 5th gear and I'll be at 90 mph by the time I am back in the right lane.

Dennis

 

That looks like a great dyno sheet to me. My compression should be close to the same. My head builder is going to take a light pass at the heads so it will bump the compression up probably around 10:2 10:3 range. Hopefully I'll end up with similar results.

 

FX4,
I am not a tuner, don't claim to be. I will warn you hard starts were a bit of a pia until i finally found a tuner that set the start-up timing and cranking fuel correct.

I have read countless posts talking about detonation issues with these cams and this compression. I haven't noticed any detonation, but I am told it could be happening without me hearing it.

I hope that is not the case and have no reason to believe it might be.

Good luck with your new build, but I would not shy away from the higher compression with 255 cams from my experience so far.

Dennis

 

I have the Power Commander Vision so I'll be able to see spark retard events.