113 inch stroker
#11
RE: 113 inch stroker
ORIGINAL: Doc 1
The HTTC CNC heads are designed for VERY high rpm running...other wise they don't have the port velocity to get the job done in the low to mid range where ever one rides........the ports are too big, bottom line!!!! Bigger is not always better and in this case this holds TRUE!! If your building a bike to run at 7000 rpm then by all means get them cause thats all there good for. Just facts gentleman, do as you please!!!
The HTTC CNC heads are designed for VERY high rpm running...other wise they don't have the port velocity to get the job done in the low to mid range where ever one rides........the ports are too big, bottom line!!!! Bigger is not always better and in this case this holds TRUE!! If your building a bike to run at 7000 rpm then by all means get them cause thats all there good for. Just facts gentleman, do as you please!!!
I won a lot of races where I actually had a lower top speed than the guy in the other lane ...all because I had more low end, I was able to attain my speed quicker. Common statement being "It's all about the torque".
The real power in the torque curve on HTCC CNC heads with the 260 Cam runs from roughly 2700RPM ... peaking around 4500 then gradually drops from there. With the 257 cams, it is roughly 300 RPM Lower. You can develop a multitude of different power curves with different cams. Yes, you can run different heads with smaller ports and get better low end at the sacrafice of top end. BUT ... if you re-read my other pos, I did point out that the OEM performance parts were all a bit of a compromise.Good all around performance, reliability and repeatable results.
Now ... it is true that the port size vs velocity is extremely important as to what RPM you create your power at ... and there are heads that produce better bottom end at the sacrifice of top end and visa-versa. I own a set of R&R heads. I know exactly what they are and their flow characteristics. I took a good long look at them before I bought them ... and I figured that for $1,000 they were worth a try.
But the statement about SE HTCC CNC heads being good for only 7000RPM is ridiculous , juvinile and an extreme exageration. Doc ... you obviously have an ax to grind with HD. But, Please don't be stupid about it. It is true .. they are not good for 2000 RPM, but like just about everything else in life, nothing is perfect. There is almost always a compromise. If you want great power from 2000-4000 rpm, youbuild an engine one way ... if you want top end, you build an engine another way. Everything else is a compromise. The SE HTCC CNC heads are decent all around, hi flowingheads. Not the best, definately not the worse.
#12
#13
RE: 113 inch stroker
I agree with Doc on this one. We have recieved many e-mails of people who have tried differant heads and combinations and are not satisfied with the factory stuff for the reasons Doc mentions. Ask Latus and Joe's Cycle how easy the R&R stuff tunes and how cool it runs and then take your R&R equipped bike and run against someof the SE stuff and see how much quicker you get there.[/align]
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The HTTC CNC heads are designed for VERY high rpm running...other wise they don't have the port velocity to get the job done in the low to mid range where ever one rides........the ports are too big, bottom line!!!! Bigger is not always better and in this case this holds TRUE!! If your building a bike to run at 7000 rpm then by all means get them cause thats all there good for. Just facts gentleman, do as you please!!!
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