SlowMoe Posted February 2, 2017 Report Share Posted February 2, 2017 Okay I am getting a 4 mill crank 115 rod with long rod pistons for my stock cylinder banshee. I am going to port it myself but I would like to get the port timings as close to optimal as possible using spacer plates. The port timings I am after are roughly that of a driveline assasin HP cylinder. I realize I may need to go a little higher with my exhaust port to have close to the same blowdown as an HP cylinder. Looking for about 198/ 126-126 That said, off the top of anyones head can you tell me the approximate port timings on this engine using a 2mm spacer, a 2.5mm spacer, and a 3mm spacer. Thanks in advance Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 2, 2017 Author Report Share Posted February 2, 2017 Because I would prefer not to touch the transfer port roofs if possible Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 2, 2017 Author Report Share Posted February 2, 2017 (edited) I'd rather just widen and drop them as not to alter any roof angles by mistake Edited February 2, 2017 by SlowMoe Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted February 2, 2017 Report Share Posted February 2, 2017 You building a drag bike? Sent from my SM-S820L using Tapatalk Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 3, 2017 Author Report Share Posted February 3, 2017 Dune/ drag. I want it to rev to the moon Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted February 3, 2017 Report Share Posted February 3, 2017 Take your time, and pay attention. I wouldn't use a spacer plate, but that's my opinion. To each their own though. Keep the curious updated. Sent from my SM-S820L using Tapatalk Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted February 3, 2017 Report Share Posted February 3, 2017 Before you get ahead of yourself, do you plan on running stock pipes? Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 3, 2017 Author Report Share Posted February 3, 2017 Take your time, and pay attention. I wouldn't use a spacer plate, but that's my opinion. To each their own though. Keep the curious updated. Sent from my SM-S820L using Tapatalk I would feel much more comfortable acheiving the desired transfer duration by raising the cylinder, since I dont have the skill/ PATIENCE to cut the transfer roofs myself. If I have to go more than 2mm to achieve this, I will deck the top of the cylinders to compensate. Before you get ahead of yourself, do you plan on running stock pipes? Got jokes now, do we CPI or shear. Probably CPI since I am also putting a turbo on my YXZ and I need to be a cheap ass. But seriously. ABOUT how much will i need to raise the cylinders/ ports to get to 126? Any clue? I do have a degree wheel but I'm wondering if I need to get a thicker spacer than 2mm to put me in the ballpark...? Quote Link to comment Share on other sites More sharing options...
sleeper06 Posted February 3, 2017 Report Share Posted February 3, 2017 If you have the ability to rechamber and cut the head to get desired squish go for it. Get a cpl head gaskets and do it up . 2 mm spacer and .020 bases gaskets will get u up around where you need . With the 4 mill crank you don't need to raise transfers much but I do like my blowdown a lil different than others Quote Link to comment Share on other sites More sharing options...
registered user Posted February 4, 2017 Report Share Posted February 4, 2017 moe you seem lost. why not tinker with some junk parts before you make a cobbled mess of your good stuff Quote Link to comment Share on other sites More sharing options...
bigweav81 Posted February 4, 2017 Report Share Posted February 4, 2017 I'd give it a go. Niche are dirt cheap, and mistakes are part of learning......Raise the roof on them muthafuckas! Sent from my SM-S820L using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
registered user Posted February 4, 2017 Report Share Posted February 4, 2017 and mistakes are part of learning..... Sent from my SM-S820L using Tapatalk yes indeed but why put the cart 100miles in front of the horse. logical thinking can prevent a few fuk ups. even before grinding up some niche I would spend alittle time on some unusuables. make a quick template on paper and trace it to the bore wall. spend a weekend, week, month, whatever it takes, and go through the motions. but in the end he'll have to decide when its time to proceed forward spacers can be good but they have their time and place. this isn't the time or place imo raising the exh to make it bigger isn't equivalent to having 3 ports. fyi Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 4, 2017 Author Report Share Posted February 4, 2017 moe you seem lost. why not tinker with some junk parts before you make a cobbled mess of your good stuff Ive done my fair share of junking cylinders lol. I feel good about this set. Can't hardly go wrong raising the cylinders as long as you have a degree wheel and keep an eye on squish and such. I got this holmes lol Quote Link to comment Share on other sites More sharing options...
SlowMoe Posted February 4, 2017 Author Report Share Posted February 4, 2017 raising the exh to make it bigger isn't equivalent to having 3 ports. fyi I understand that. But to have close to the same blowdown as a set of tripples at 196 degrees, a lot will have to be done to widen and re shape the exhaust port and it will need to be raised as wel in my opinion. Hopefully there wont be much transfer work in this build and I can focus my very limited time on perfecting the exhaust ports. Quote Link to comment Share on other sites More sharing options...
registered user Posted February 4, 2017 Report Share Posted February 4, 2017 good luck my friend Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.