mopar1rules

I did .030" w/zero issues.

who made these pipes for pro design? any info on them? are they good? http://cgi.ebay.com/ebaymotors/ws/eBayISAPI.dll?ViewItem&item=290458758263&fromMakeTrack=true&ssPageName=VIP:watchlink:top:en

what's the info on the non-polished cylinders? bore size? ported? re-decked or anything?

jeff, i pm'ed you about the dg front bumper

unfortuntely you're going to have to split the cases and see what's going on in there.

You'll need to run higher octane fuel, w/the added compression from the 18cc domes. Too low of octane and you will deto. You might be detonating now already, and that might be the reason your getting an engine brake feel on top end.

just to clarify, stock carbs aren't 28mm, they are 26mm.

64mm is stock piston size. what you are reading, is .50mm, which means you have a .50mm overbore, which is also the same as a .020" overbore. your current piston size is 64.50mm. hope this helps.

if it were me, i would raise the rear boost port, so it ends up being 1mm lower than the main transfers and then have the secondary transfers, open .5mm after main.

the squish band ain't at no 30deg angle. and neither is the "bell" of the dome. that is cut at a radius. it's a hemispherical dome.

dome appears to be modded. that's not how they are right from pro-design.

brandon, you don't like mastercam?

I never heard of Gibbs either. I use Mastercam at work too. Its drawing portion to the program is good for $hit IMO. I always wanted to try Catia. On the solidworks we have at work, we have the sheet metal and assemblies capabilities. Me and my boss have done numerous complete machine assemblies. I then made exploded drawings of the machines we manufacturer, for use in the owners manuals and such.

I use Solidworks. I like it. To me, its user friendly. Its nice when you change the parts dimensions, that it automatically changes the print for you too.

I use autocad at work as well. IMO, its the best 2D CAD program out there. The 3D portion of autocad is terrible tho. Those boolean commands and all......what a joke.

Yeah, I use solidworks and like it a lot. Seems pretty user friendly. I never tried catia, but always wanted to. I also wanted to try Pro-E. Yeah, I know what CAD/CAM stands for. I deal w/it everyday. Just never heard of corel:) One program that I think sucks and is a bear to use IMO is BobCam.

Just curious, but what the hell is "Corel"?

I read the description of the pistons, in that link you posted, and it sounds like bs. C'mon, like pistons w/boost ports are just going to make you beat stroked and big bored banshees. Its going to take more than boost ported pistons IMO. And then for under $100 for a pair!! I'd like to see/hear of a longevity report, from someone that used them first.

I never heard of M&H pistons before. I'm going to be trying the WSM pistons on my next build. There is a guy on here named FouledOut, that runs WSM pistons w/good luck. The gasket match you speak of is talked about all the time on here and is worth it IMO, especially when looking for every little bit of HP. I "ported" my upper crankcase half myself. I didn't notice anything huge, just maybe slightly better throttle response.

Oh, you said 122* deg ATDC for transfer opening....that would yield 116* deg of duration for transfers and now I see how you're coming up w/38* deg of blow down. If you want your transfers setup to better suite your riding style, I can work your cylinders over for you. For the program that I used to calculate your durations, its called "port mapper". I had gotten the program off this site last year some time. Some fella posted it and I downloaded it. Maybe someone can post the link to it, as I couldn't find it while searching. There also is a excel spreadsheet program floating around on the web somewhere that will do the same thing. I found that program as well on some moped forum:)

Yeah, I have mine set for 32* blow down now, and running more compression and now it works for moto-cross. I would not suggest anymore blow down than 32* either. If I wasn't running the 14.8:1 UCCR that I am running now, I think the 32* blow down would still be a bit much IMO for moto-cross.

Brandon, I was using .5mm for deck height. My buddies is .017" w/cometic base gaskets (can't remember the thickness) and mine is like .024-.026", using moose racing base gaskets. Banshee engines are "suppose" to be zero deck motors, but any of us that play around w/these engines knows otherwise.

I ran your dimensions on my computer program and don't get 122* of duration for your 43.5mm deck to roof dimension. I get 120* deg instead. For your 28mm from deck to exh port roof dimension, I get 192* deg. So, if I use your exh (192*) and trans (120*) duration figures, I come up w/36* deg. Are you sure you have 38* blow down? Your shee would be super "pipey" and an absolute bear IMO to race motocross with, using them porting specs. I tried some specs that were kinds like yours (188* exh, 117* trans, 35.5 BD) for some motocross and found it to be falling off the pipe all the time. I also noticed in your port map, that you have some "staggered" porting going on.....your boost appears to be opening before the main and second transfers.

i'm sure that the roof angles and the rear "hook" on the secondary transfers, could be improved upon, especially for a drag port.

Adding compression will always help out throttle response and low end grunt all the way to top end and its cheaper than either of the above options.