Maximum Streetable Compression Ratio?

hobot said:

oh yeah it takes tedious experiments with this and that to get optimalized and even though you'd done something right - that will eventually really help kick ass - it may fall on its face until another vital detail dealt with then surprise surprise. 360' firing pulses are made for 2-1 extractor system. Hollow Dunstall mega with just end plate weights under 4 lb. W/o end plate it both bogs down low and injures ears of people and animals to point I'd feared farmers shooting me from running the weigh off their cattle and horses over fences.

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I used to weld a nut to a washer that had an O.D. a bit smaller than the I.D of the pipe. A bolt W/a locknut was then inserted from the outside. I did this W/both drag pipes & my 2-1 collector. The washer can be angled to adjust back pressure, and then the locknut would be tightened down. “Star” washers both under the washer/baffle & locknut keep the adjustment from shifting.

Straight pipes might gain a 2-3 HP @ maximum RPM, but they give up several times that in the midrange where it’s needed on a road bike. That loud “blat” from improperly tuned straight pipes is energy going out of the pipe & not into the drive train. A properly tuned exhaust should have a growl that increases to a roar @ max HP, not an obnoxious BLAT. :roll:

I think I would prefer a good 2-1 collector on moderately hopped-up Norton. :twisted:

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Straight pipes might gain a 2-3 HP @ maximum RPM, but they give up several times that in the midrange where it’s needed on a road bike. That loud “blat” from improperly tuned straight pipes is energy going out of the pipe & not into the drive train. A properly tuned exhaust should have a growl that increases to a roar @ max HP, not an obnoxious BLAT. :roll:

I think I would prefer a good 2-1 collector on moderately hopped-up Norton. :twisted:

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Ugh, When Peel was in her prime accidental set up her shot out Dunstall megaphone would go BlATT! over red line before ya could finish snapping to WOT and back. Won every tack needle race over 5000 rpm gain range spotting the in line 4 wonder 4000 rpm to Peel 2000 starting rpms. But when I put on Combat head and dual Amals and the megaphone mount broke off she flat dogged out so bad could hardly start off from idle or putter across yard w/o bogging stalling and never developed power no matter how fast rpm wise with the open header. I put in the turning washer at Ohio rally but it didn't help very much. On the other hand my P!! dragster with like 11+ CR and shorty drag pipes was a terror off idle and lugged in 4th no problemo, even on one cylinder at times. 360's twins are made for 2-1 extractor and each side of Norton exhaust system weighz around 10 lbs. 750 Peel liked her 1.5" dia 2-1 mega system and was last factor to relieve my deep depression I'd build a sluggish Commando 1st time around.




Do note the bolt in side stand and frame clearance increase from hobot fork 6" travel mods that allowed rather more lean angle and still scrapped toes off boots in surprise till pulling them back to lean more yet till rear set pegs fouled. Made me lose respect for the poor balloon tire things and tease em into contests hehe.