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You still need a better transmission, clutch, compensator, etc. or all that power will blow up in your butt! I know now why HD is building like they do....all the after market companies must be on their payroll?
According to their homepage today it is 11.1:1. Maybe they changed the Pistons since you bought your kit?
Damn. Thanks for the heads-up. I just saw that. Possibly. THought they might have gone domed but their site still says flat top.. Will give them a call to find out.
Originally Posted by WRE4U
You still need a better transmission, clutch, compensator, etc. or all that power will blow up in your butt! I know now why HD is building like they do....all the after market companies must be on their payroll?
Either that or run into problems later. My clutch Clutch is done (SE clutch pack with AIM SDR lock up), Compensator is getting deleted with an Evolution 34 tooth sprocket in a week or so, Did this on my SG with an S&S 124 crate motor and it worked out really well. Transmission, Im leaving alone.
So. I contacted RevPerf this morning and asked about the change in compression listed on their site. Turns out, their original 124 M8 prototype kit was 10.7:1. Once they started selling the retail kits to the public, the compression was bumped. In error, this was never corrected on the site until recently. She stated that all the 124 M8 kits that theyve sold have been 11.1:1. This actually make a lot more sense to me referencing other 124 flat-top piston kits in the market.
I just cant seem to search and find the right thread for my questions. I know Steve Cole is on this one, and some other wise men, so;
I have a 2019 FXLR, which has a 4.375 stroke. I did a custom build, with 124 Daytonas, KB +4mm pistons, 12:1CR, Don Dorfman ported my heads and did O.S. valves and H.L. springs, S&S rocker shafts/studs, HPi 62mm TB/Tunnel ram, Don port-matched intake manifold to ports, CR540 cam, factory CSP/OP(2020), 7.1gps Daytona injectors Bandit clutch, BDL comp. sprocket, Evolution 49T clutch basket(+3T over stock), Bassani 2-1, and stock Primary tensioner(Hayden had issues, as did the Feuling CSP/OP).
This was my first Harley. I did all the research myself, and built it all myself. I originally did a stage 2, then started over with all of this. Don guided my hand, here and there. I had it dynoed by Chris Waddell at CSR, at Laconia, NH Bike Week 22. Heres my chart. Heres my question(after peeping the chart);
why are some getting close, even, and maybe slightly better numbers with stage 3s and bolt-on stage 4s? Or is this just dyno magic dust?
In case its fuzzy; 139hp/143tq
So someone built this same build and made more HP/TQ?
He just asked if it felt like it ran well. It runs Perfectly in every way. No, Im pretty sure Im the only one to do this build, certainly the first. My thing is, there are tons of people claiming they got 130hp/150tq from a stage 3, which is nonsense I know, but for the amount of extra labor and parts I put into this build myself, I expected at least 150 square, or in that ballpark.
He just asked if it felt like it ran well. It runs Perfectly in every way. No, Im pretty sure Im the only one to do this build, certainly the first. My thing is, there are tons of people claiming they got 130hp/150tq from a stage 3, which is nonsense I know, but for the amount of extra labor and parts I put into this build myself, I expected at least 150 square, or in that ballpark.
Well I think you are learning that it's a little bit more than selecting a bunch of unmatched / tested parts, tossing them together and expecting certain amount of output. First place I'd look is the exhaust pipe because it's easy to change. Get yourself a nice Burn's pipe.. I could not find cam specs and you didn't state compression ratio.. If Don, port matched the heads, did he flow the whole intake track?
It's totally possible that the Dyno is stingy, The operator should know..
Found the CR-530. Cr should be close to or better than 11.5 to 1.
It has a 12:1 compression ratio. Im running an UltraCool oil cooler, and FLO filter, to keep it cool. Yes, Don tested them throughout. Hand-blended the intake manifold to the intake ports, and used a set of valve springs he liked. Its got +1mm valves, I believe, and he filed my rings to 3.5. He was explaining the whole formula for ring-bind, and he taught me how to properly measure for zero-deck, with domed pistons. He taught me a lot, actually. Great guy! I really hated moving back East, I liked hanging out with him on the weekends.
As far as matching parts, I did a ton of research, over the last few years, and he made sure the combination I used was synchronous/harmonious. Don did say the exhaust might hold me back, because its a short, megaphone. Im checking out that exhaust you mentioned. I originally bought the Bassani RR2, when the bike was new, from the dealership. I spent so much money, to build the engine, I figured if the exhaust needed to be replaced, I could let my wife cool-off a little, and pick a different one on credit
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