broncbob Posted March 13, 2011 Report Share Posted March 13, 2011 Thinking of stepping up from my 4 mill stock bore, aggresive dune port, to a clean up port cub. How much power increase should I see? I have been on a drag port cub, and it kills my stock bores, but never been on a clean up port. Quote Link to comment Share on other sites More sharing options...
zach45 Posted March 13, 2011 Report Share Posted March 13, 2011 [----------------------------------------------------------------------------------------------------------------------------------------] - that hard Quote Link to comment Share on other sites More sharing options...
RadarRacing Posted March 13, 2011 Report Share Posted March 13, 2011 Honestly a cleanup port runs like an out of the box cub. It's kinda like the "Aggressive dune port" thing. Its more aggressive. Lol Quote Link to comment Share on other sites More sharing options...
broncbob Posted March 15, 2011 Author Report Share Posted March 15, 2011 I'm guessing that the 421 is going to kill my 371 aggressive dune port? Quote Link to comment Share on other sites More sharing options...
J-Madd Posted March 17, 2011 Report Share Posted March 17, 2011 There's not a lot of power to by found out of a 421 Cub with porting. You can probablly get more peak hp out of one, but it won't necessarily be faster at the track unless you have a super light rider/chassis. I dynoed one of my 421s and got 100 hp with a cleanup port with little tuning. Lots of tuning and with it drag ported (port timings probably not changed) and got 103 hp. Maybe could have got the 103 hp on the cleanup port with more tuning, but I was satisfied with it. The guy who ported it said it would take waaaaaaaayyyyyyy too much time/work to get the max hp out if it. I wanted it reliable, and lasting as well.It may have 5 hp left on the table, but it's not cost/time efficient, and would lose some reliability. You know the saying - the first 80% takes 20% of the time, the last 20% takes 80% of the time. JMO. Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted March 17, 2011 Report Share Posted March 17, 2011 You're probably talking about 10 hp or so more with the cub, depending on who did your port work. Quote Link to comment Share on other sites More sharing options...
Hilarious Posted March 17, 2011 Report Share Posted March 17, 2011 421 cub with no porting runs damn good from what i have seen. But at the same time, i think my cub with the little bit of drag porting on it runs damn good too. Mine ran high 4teens on methanol in stock uncut chassis with 250lb rider in 300' What are you going to do with it? Strictly drag race it, if so and you are looking for every little ounce of hp, port it. Otherwise run it like it is. They run great both ways. Quote Link to comment Share on other sites More sharing options...
beebs Posted March 18, 2011 Report Share Posted March 18, 2011 I have also done alot of research on this topic. I read through lots of posts and talked to many of the site sponsers. What I come up with is ya, the cub runs extremely hard with just a cleanup. All builders would drag port it but only some highly recommend it as a worthwhile gain for the price and work. The ones that were more for it, I felt maby had more R and D time with it and were more happy with the outcome. Don't get me wrong, all these guys know what they're doing and make some mean motors, they all just do it a little different. My verdict is a "fully blue printed comp drag ported" cub, will have significent gains over just a cleanup, when both are properly tuned and setup equal. Quote Link to comment Share on other sites More sharing options...
jbooker82 Posted March 18, 2011 Report Share Posted March 18, 2011 There's not a lot of power to by found out of a 421 Cub with porting. You can probablly get more peak hp out of one, but it won't necessarily be faster at the track unless you have a super light rider/chassis. I dynoed one of my 421s and got 100 hp with a cleanup port with little tuning. Lots of tuning and with it drag ported (port timings probably not changed) and got 103 hp. Maybe could have got the 103 hp on the cleanup port with more tuning, but I was satisfied with it. The guy who ported it said it would take waaaaaaaayyyyyyy too much time/work to get the max hp out if it. I wanted it reliable, and lasting as well.It may have 5 hp left on the table, but it's not cost/time efficient, and would lose some reliability. You know the saying - the first 80% takes 20% of the time, the last 20% takes 80% of the time. JMO. I guess that backs up the fact that the Cub is cast as a drag port out of the box. Quote Link to comment Share on other sites More sharing options...
okbeast Posted March 21, 2011 Report Share Posted March 21, 2011 Mine runs pretty damn hard, trying to decide if I'm gonna get it worked on or just go to a bigger motor. Quote Link to comment Share on other sites More sharing options...
Hilarious Posted March 21, 2011 Report Share Posted March 21, 2011 Mine runs pretty damn hard, trying to decide if I'm gonna get it worked on or just go to a bigger motor. Im in the same boat as you right now. Im just not ready to throw down the several g's its gonna take to knock off a .10 of a sec. Lol Quote Link to comment Share on other sites More sharing options...
okbeast Posted March 21, 2011 Report Share Posted March 21, 2011 Im in the same boat as you right now. Im just not ready to throw down the several g's its gonna take to knock off a .10 of a sec. Lol Exactly, I'll probably do a different chassis/alky before I do more motor work Quote Link to comment Share on other sites More sharing options...
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