stroking Posted March 27, 2012 Report Share Posted March 27, 2012 whats the max duration used on a 1/8nike drag CUB motor ? 198/134 200/132 204/130 some say 196-197 128-130 but thats pretty stock,might as well not even port it for that Quote Link to comment Share on other sites More sharing options...
m671054 Posted March 27, 2012 Report Share Posted March 27, 2012 What stroke??? Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted March 27, 2012 Report Share Posted March 27, 2012 201/130 Quote Link to comment Share on other sites More sharing options...
springer Posted March 28, 2012 Report Share Posted March 28, 2012 i know of a bike or two with exhaust well over 201 that run pretty fuckin good. i would call around and find a builder that likes em like that. not everyone will. Quote Link to comment Share on other sites More sharing options...
stroking Posted March 28, 2012 Author Report Share Posted March 28, 2012 What stroke??? 7mm and 10mm Quote Link to comment Share on other sites More sharing options...
BigRed350x Posted March 28, 2012 Report Share Posted March 28, 2012 7mm and 10mm Jim @ Passion likes a shit ton of exhaust on his setups. Quote Link to comment Share on other sites More sharing options...
camatv Posted March 31, 2012 Report Share Posted March 31, 2012 high durations wwill usually make the powerband peak much higher. and cna also narrow the band up. more transfer duration will make the tq curve come up BUT can lead to issues with the burn mixture and possible - pressure in the transfers. also differnt pipes react differntly to higher and lower durations. head profiles can affect the power output as well. and of course PV motors like a completely differnt port timing and can do things fixed ports will never be able to live with. rider weight, bike weight, fuel used, bike condition will all atribute to what a motor "feels like" with a higher port timing. i cannt say it enough just "porting" isnt the only thing you should concern yourself with.. also i have played with transfer velocity's / intake designs and gotten all kinds of differnt power "feels" out the same port numbers.. Quote Link to comment Share on other sites More sharing options...
Wildcardracing Posted March 31, 2012 Report Share Posted March 31, 2012 Cub motors scavenge very well with the right pipe setup. IMO exhaust numbers that high are unneccessary and will only hurt the curve. Most of the power in porting a cub is in the tripples and transfers. Much will also depend on what pipe you are planning to run. With a cub most of your power gain is going to be found in the dome design once you have a good clean port layout. Going beyond 198 is a waste IMO. -Brandon Quote Link to comment Share on other sites More sharing options...
stroking Posted April 1, 2012 Author Report Share Posted April 1, 2012 Cub motors scavenge very well with the right pipe setup. IMO exhaust numbers that high are unneccessary and will only hurt the curve. Most of the power in porting a cub is in the tripples and transfers. Much will also depend on what pipe you are planning to run. With a cub most of your power gain is going to be found in the dome design once you have a good clean port layout. Going beyond 198 is a waste IMO. -Brandon is there a point to where you LOSE power if the exhaust is taking to high? i know of a stock cylinder 4mil on alky running 208 ex/135 trans and it runs HARD!!! im not sure i want to take a cub that high most say to leave trans at 130 but thats stock on a cub so that cant be the best power numbers on the trans Quote Link to comment Share on other sites More sharing options...
registered user Posted April 1, 2012 Report Share Posted April 1, 2012 its not banshee but on my personal honda i did 199/135 with cpi pipe and it went pretty good last year. in the process of changing a few things for this year Quote Link to comment Share on other sites More sharing options...
camatv Posted April 1, 2012 Report Share Posted April 1, 2012 good lord!! if i did that the motor wouldnt even get out of the hole!! ive never ran a cub over the 198* exhaust either. i ahve rode a few with higher exhausts and yea they hit harder but to me they were much slower overall. Quote Link to comment Share on other sites More sharing options...
registered user Posted April 1, 2012 Report Share Posted April 1, 2012 (edited) alot of it is in the final gearing but if your using the later model honda engines you want to swap the 4/5 gears for the '91 then you get about 7-8mph between all the shifts and it doesnt let you rpm drop too far Edited April 1, 2012 by registered user Quote Link to comment Share on other sites More sharing options...
camatv Posted April 2, 2012 Report Share Posted April 2, 2012 i could see 198/135 on a single honda Quote Link to comment Share on other sites More sharing options...
sheerider1026 Posted April 2, 2012 Report Share Posted April 2, 2012 Its hard to compare durations from stock jugs to a cub. Cubs have tripple ex and transfers, stockers do not. Im not saying oem jugs cannot run hard cause they can. Even in stock stroke form they can be fast.. Dont forget that bigger isnt always better. Velocity is something that often is forgotten about.. I just did a set of stockers at 194/128. . It should be fun for a stock stroke Quote Link to comment Share on other sites More sharing options...
m671054 Posted April 2, 2012 Report Share Posted April 2, 2012 Dont forget to take into account your stroke. You cant compare stk, 4 mill to 7,10mill. You piston speed on the long stroke is going to be faster requiring lower operating speeds for the pistons and rods to live. This means lower timing numbers. I agree with the others and wouldnt go much over 198. Also tranfer port roof work is more important than a number Quote Link to comment Share on other sites More sharing options...
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