THE358BANSH

Thanks for the offer! I said screw it and cut down my current swinger by 1.5" just now so this thread is no longer needed..

As the title says, I'm looking for a -1 or -2 roundhouse swingarm, cheaper the better. It doesn't have to be pretty or fancy, just short. Thanks, Evan

I would be leery of using the spark plug threads for your centering. I have seen a few that are .040" off center compared to the bores. Other than that it looks pretty nice for what you are working with.

The best way is to run a relay off the light switch. The switch and wiring up to it are too small for the type of current that some of these lights draw.

Blake, The RZ topend runs strong and has a bunch of low end compared to my play ported cylinders. Thanks a bunch for the parts! Evan

Is the cover PC'd or painted? How much for it without the lock up? Thanks!

In between the center crank bearings there is a Labyrinth seal.

Could you get away with using a nylock jamb nut? They are probably a quarter inch shorter than the standard nut.

To add some more to this thread about piston dome volume I played around for a bit today while parts were washing. I weighed a 65.5mm 795 series Wiseco with no rings, no wrist pin, and no wrist pin bearing. Total weight of the box stock piston was 207 grams. I chucked in in the lathe and turned .160" off the dome to make it a flat top. Total weight of the flat top piston was 188 grams. Original piston weight 207 grams - Flat top piston weight 188 grams = 19 grams of material removed 19 grams removed x .0022 lbs/gram = .0418 lbs of material removed .0418 lb of removed material / .0980 lb/in3 weight per in3 of aluminum = .42653 in3 of material removed .42653 in3 x 16.387 cm3/in3 = 6.989 cm3 of piston dome volume Obviously that number will change with piston series, bore size, and if the dome angle as been modified.

I have never used the BiMotion software. The TSR software is the universally accepted standard, but sucks now because Tom is no longer handling everything. I would like to get my hands on a copy at some point in time to do some comparing. If I remember correctly the TSR software also has a recommended octane starting point based off inputted figures and dome profile, right? The burette has its issues also with fluid sometimes not getting into every crack and crevice, along with people getting carried away when applying the grease seal. I think the best way to figure all of this would be FPV the dome with a spark plug, then account for other volumes by software/calculation to arrive at a compression value. Then use software of choice to determine the MSV of the entire package... Evan

Thanks for the reply Brandon. Would you care to share how you came about that figure? If you don't want to I understand...

I don't remember exactly where it came from. I want to say either the old MacDizzy site or a RZ350 forum, one of those two almost positive. As for the dome profile, I just went next door and looked at a 795 series for a 65mm bore because it's all I have around now. I measured it up and I am coming up with 10.32cc? Seems a bit far out and in the wrong direction to me... As best I can measure here is the cross section of the piston dome profile...

Stock Banshee numbers: 64mm bore x 64mm bore x .7854 x 54mm stroke x 1 cylinder = 173,717.9 cubic mm 173,717.9 cubic mm ÷ 1000 = 173.72cc swept volume for one cylinder Flat plat volume of CoolHead dome is 20cc with spark plug crevice volume Piston dome volume of 64mm bore piston with 120mm dome radius = 7.0cc 20cc flat plate volume - 7.0cc dome volume = 13cc trapped volume @TDC (173.72cc swept volume + 13cc trapped volume @TDC) / 13 cc trapped volume @TDC = 14.36:1 uncorrected compression ratio The other option if you have a super computer...

Thank you sir, be right back with some info all fancy like...

What types of uncorrected compression ratios have you guys ran on pump gas with proper head design? I'm trying to decide on whether to run pump fuel or stay with VP110 for my new build. The design of the head is pretty critical so I am looking for people running tight squish(.036"ish), squish bands around 50%, an nice hemispherical domes(no tubs or toroidal stuff). I have heard of up to 15.76:1 with +4 timing @1000 feet of elevation in some drag applications. Albeit that application was not ran for long periods of time whereas mine will be. Looking at your typical Banshee(64x54) with proper squish and a "20cc" dome our UCCR is 14.36:1 and is well known to run with +4 timing on 93 pump fuel with proper jetting all day long. How much further could that UCCR be stretched before having to reduce timing or start mixing fuel? I figure if I have to cut fuel I'll just say screw it and run straight VP110 with the timing and compression to match. Also, since I touched on the full race gas builds. Where do you think the tradeoff occurs between high compression and pumping losses causing the engine not wanting to rev out? Where would the cut off of UCCR be in a full drag build with a good amount of exhaust duration(200+), decent timing, and 110 motor octane fuel? I have two different domes designed currently, one for 93 and one for 110 and both of them have great MSV numbers. What say you? Evan