N/A "spinner" engine

[vugbug68]

I have a few parts laying around and I'm thinking of building a high rpm spinner engine. I saw this video of a 64x94 1776 built by JPM https://www.youtube.com/watch?v=hgsjzTOm4EE and it got my mind thinking, not that I'm going build something that crazy but I like the principle of it.

I'll probably do a 1915 or 1835 thickwall with B pistons and long rods. Try to keep the engine narrow and the valvetrain light. Cam with a lot of duration but mild ramps.

I have a nice case opened for 94's and a nice 8 dowel non counterweighted German crank.

I have a set of Tim's stage 1 heads and another set of ported 42x37 heads but I have no idea who ported them.

Anyone build a high rpm spinner?
suggestions?
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71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin

[spencerfvee]

sounds like a cool build . go for it .spencerfvee

[Brian_e]

Keep the rods short and cut the barrels down to make it all work. The tin and header will become a problem, but the much shorter pushrods will be lighter and stiffer. B Pistons are usually slipper skirt, and are much lighter then full skirt A Pistons. I have been collecting parts to do the same.

Just make sure to do your math so your minimum cross section is up to par with your projected peak rpm.

Brian

[rs58rag]

Get your crank counterweighted and use the Tims stage one heads.

[fuguboy]

How can you tell where stock crank was made ? why is 1500 cranks strongest and how do you identify ? What rpm is it ok to rev a stock 8doweled balanced crank and balanced rods 6000 ok ? Was thinking of a web 163 with 1.25 rockers . 1915 with Tims stage 1 40x35 maybe not a spinner like original poster just not sure on stock non-cw crank .

[theDrew]

I wanna say there was a thread on cal-look forums that covered that build.....trying to find it
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[theDrew]

start at the bottom of the page and read on:

http://cal-look.no/lounge/index.php/topic,3257.690.html
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[GTV]

I like the idea but I don't think the trouble of using a 64mm crank is worth it. Just use a 69mm, 1915cc, same parts, more power, less cost, easier to build.
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EMPI Power Rules!

[vugbug68]

[vugbug68]

[theDrew]

thick walled 92's! i'm assuming you'll be running a high compression ratio, so that'll help take the heat
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Turbo 2276 MS3X build http://www.thesamba.com/vw/forum/viewtopic.php?t=673125
1985 Vanagon Campmobile w/ 2005 EJ25

[Brian_e]

Read through the entire thread linked above, and take notes whenever Johannes posts. His super light shorty pistons are the key to making the stock crank live above 7000rpm. He gives all the equations showing how they put less force on the crank above 7000rpm then a stock piston does at 5000rpm. His is a 1603cc, and made 194hp around 8000rpm.

Brian

[Bashr52]

Find an old roller crank and let it rev!

[bugguy1967]

[mark tucker]

hey stupid high rpm requires heads that are capable of the high rpm, and heads off the stage coach wont get it.unless your one of those guys that think high rpm is 4000 rpm or likes wiring a 4 cyl tack like a 8 cylinder tach.......and then theres the exhaust, and the induction and ignition....and tit valves,trick springs,right rockers,right cam,right retainers,right pushrods........ yup throwing your spain parts togeather will do just that spin high then...........splat so...go fer it and postaa viedieieio.

[rosevillain]

I have a 69mm counterweighted crank that probably needs work (balance and such), that I would be willing to trade.

[Bob Brugge]

[HotStreetVw]

Engines are air pumps. You might be able to breath through a straw sitting in your office chair, but you wont do it running a marathon.

Intake port cross section will dictate the maximum power potential. Period.

The 1776 has MS230s, JPMs 1915 has MS230s. Thats 230cfm @ .600" lift.

If you want a small motor to spin high, build a 1915 with a set of ultra wedgeports.

One thing to note is the JPM motors are pusing the boundries for HP/liter. If you don't have a lot of money to spend, you might as well make that 220 hp with a 2386cc at a much lower RPM.

Play with this calculator. It basically use mass flow rate to calculate HP. Keep the engine type constant and try different engine sizes. You will notice for the same head flow, the HP will remain constant, the RPM changes.

http://www.wallaceracing.com/calcafhp.php

[Brian_e]

What he said ↑.

If you dont know an accurate airflow for your heads, you can use this calculator to figure what your max RPM will be given the minimal cross section of your intake tract. Measure the smallest diameter, convert to area, and then plug in your numbers.
http://www.wallaceracing.com/chokepoint.php
Remember this is assuming your heads are perfectly ported, and not some as cast head with big valves tossed in.

Most properly done intake tracts will have the min. cross section just below the valve seat. With off the shelf offset and straight manifolds, the diameter about 1" up from the flange is smaller then the seat diameter on a 40mm intake, so that would be the smallest point, and also the reason all manifolds need to be FULLY ported, not just match ported. Think smooth even tapered funnel, ending in the correct cross section for your desired RPM range.

This one will work backwards for you. You input your bore, stroke, and projected max RPM, and it will tell you the smallest your cross section can be.
http://www.wallaceracing.com/ca-calc.php

Brian

[mark tucker]

I think the flow of the heads may be a better thing to use..... as properly is extreamly vauge term and meas oh somuch different things to different people&also different porters...and different applications also have different porting techniques.