Considering a 103 cam swap
Now, to your other points; the 57’s are good, but unless you add compression (which at least #2 did with a .030 head gasket) or do the +4° crank gear, the later intake closing of the 57’s (38°) pushes it more to a mid range cam. I’m also betting the stock headpipe was de-catted.
So, youre saying a decatted header performs better then a stock haeader. Tell us, what gains does a decatted header have over stock header? How much and where are they? Does a decatted header perform the same as a $500 header? And what is the ideal compression for 57s?
Despite what you "think" about stock or decatted header and 57's compression requirements, 57's with stock compression and without the $500 header performed sop same as 222's with a $500 header. And if you "read" the sheets, the 57s with stock header peak tq was at same rpms as 222. Does that make the 222 a midrange cam also?
To be clear, I dont care what cams, header, mufflers, others run. Most seem to like what they chose and thats how it should be.
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Even with my $500 header, the 222's break a hundred at 2500 rpm's. With more back pressure, they'd probably be closer to 2000 rpm's. Honestly, I don't know what I was thinking about the decatted header
Besides, what point were you actually trying to make? I said I'd choose the Cyclerama 570's over mine, knowing what I know now. The 57's are irrelevant
Last edited by Bafflingbs; Jan 14, 2018 at 07:29 PM.
Not all dynos are the same. Same dyno, different teck different #'s. TTS Tuner and a good dyno tune will likely help. #s on a piece of paper are just that.
Even with my $500 header, the 222's break a hundred at 2500 rpm's. With more back pressure, they'd probably be closer to 2000 rpm's. Honestly, I don't know what I was thinking about the decatted header
Besides, what point were you actually trying to make? I said I'd choose the Cyclerama 570's over mine, knowing what I know now. The 57's are irrelevant

decated header does nothing for performance. At very best, 1-2hp at the very far right. Certainly does nothing for low end.
The 57 sheet has FM jackpot mufflers. My 1.75 fullsac baffles have nothing to do with it. Headwork?
To say 57s are "irrelevant" is an interesting opinion. Depending funds and the rider, that may not be the case. If they ride like me, and the wallet is thin lol, and live in the 2400~2800 rpm range, then the low end gains of the cr570 are less important then someone that lugs at 2k rpm. Dont get me wrong, more area under the curve is always better. However, Im not one to buy into the "best cam", "best oil", "best shocks".... concept. However, I do buy into the notion that several cams work very well in 103's.
What would be interesting is a cr570 dyno with a stock header, stock 103. That may convince me about the "best cam" in a 103".
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disappointed but to do over it would be the 48's. Why - when my not small lady gets on I'd like the torque band a little lower with the stock
gearing.
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