Other engine possibilities

dna1997 · Post by **dna1997** » Thu Jan 29, 2004 7:15 pm

If you wanted to go that far, why not just have the gears cut in a reverse pattern but helical? If you're going to have them cut, then why not go all the way. Actually, I'd have them hypoid cut for the extra strength and quiet operation. The whine might get old.

It's completely doable, but you're basically just building a special, one-off tranny. Nothing wrong with that, just expensive.

Baja Wes · Post by **Baja Wes** » Thu Jan 29, 2004 8:48 pm

Straight cut gears are not stronger than helical, it's just that they are more efficient than helical gears. Good gear manufacturers will make striaght cut gears that are stronger than the stock helical gears, but that has more to do with manufacturering and steel type than the gear type. Aftermarket helical gears are stronger again. Race-cars use straight cut gears for the improved driveline efficiency.

A hypoid gear is a pair of gears with their axis are 90 degrees and offset in different planes, it only applies to Diff gears in a car. You cannot get hypoid gear-sets.

rotary-z · Post by **rotary-z** » Fri Jan 30, 2004 2:41 pm

That is way too much work for what you are getting. I would go with something that people have done (rotary/subaru/ford), so you have the support. It will be different, I am rotary powered, and have only seen one other car with a rotary in it. For me, I like the simplicity of the rotary. instead of dealing with all of this....

You only need to worry about this

dna1997 · Post by **dna1997** » Fri Jan 30, 2004 3:00 pm

A hypoid gear is a pair of gears with their axis are 90 degrees and offset in different planes, it only applies to Diff gears in a car. You cannot get hypoid gear-sets.

You're right. I got overly excited and used the wrong term. I meant to say I'd have them helical cut for strength and quiet operation.

bb · Post by bb » Sat Feb 07, 2004 1:06 am

If you want to use the honda engine - concider using the honda trans axle as well, you will get a more accurately shifting car. Instead of spending money on an adaptor you can spend it on conversion axles. I'm not sure but the engine may even fit under the hood better sitting transversly like it is in the honda.

Post by **Marc** » Sat Feb 07, 2004 6:20 am

RACER H-4 wrote:...he does flip the R&P but he was thinking about getting one made so that it was the exact opposit of stock so it could use a vair ot honda engine...

You be sure to tell us how that works out, OK?

BTW, 4th is one of the first gears to suffer from reverse rotation. Straight-cut gears are not inherently stronger as only one tooth at a time is under load rather than there being a smooth transition from one tooth to the next - it's only because they typically are made with fewer, thicker teeth that they are generally perceived as being stronger (and that could be done with helical gears if noise wasn't a concern).

capsoval · Post by **capsoval** » Sun Feb 29, 2004 2:02 am

Get a S2000 motor. Not much bottom end but still more that most well built 1776's. They rotate the correct way, and redline at 9800 rpm. You could really hall ass with that setup. Might be kind of hard to get it to fit though. I used a 13b rotary in mine. I just liked the simplicity.

http://community.webshots.com/user/capsoval

miller · Post by **miller** » Mon Mar 01, 2004 6:41 pm

Id say get a turbo rotary rather than a s2000 engine. Just check out the possibilities on the KEP site.

capsoval · Post by **capsoval** » Mon Mar 01, 2004 8:01 pm

Turbo rotarys are cool and space friendly, but you will never get flawless drivability out of one. I love their simplicity, but they are time bombs. There are a lot of little places were failure is waiting to happen in rotary engines. An S2000 motor would be really cool to do. If you had one, you would have a 240fwhp engine right out of the box. Remove all the smog crap, power steering pump, A/C and put a free flowing exhaust on it and I bet it would make about 260fwhp and still run like a brand new car, and run 150,000 miles without flaw. I am not saying that you should do an S2000 swap, but I will say that it would work a 13BT real easily and won't blow when it hears its first ping.

Wildrider49 · Post by **Wildrider49** » Mon Mar 29, 2004 6:41 am

On the Porsche 901 trans anyway. I dropped the full gear set from a 914 trans into my 912's 901 trans. The only diff between the transmissions is the flipped R&P. Remember, 914's are mid engine, my 912's a tail dragger. I don't see how it could be an issue doing the same thing on a bug transmission. Don't alot of the mig-engine sand rails do this?

miller · Post by **miller** » Sat Apr 03, 2004 1:02 pm

Just to clear the rotary name. If you have a TURBO rotary then you have a timebomb. But the N/A rotary is a 200,000K engine tried and true. THe only weak spots of a rotary is they like to overheat and the apex seal goes if you detonate. Hmm whats so different about a piston engine and a headgasket? Just coll em good and dont put a turbo on them and youll be fine.

bwheely · Post by **bwheely** » Mon Apr 05, 2004 9:56 pm

the reason to use a straight cut gear over the helical is the straight cut gear doesn't have any side loads(pressure) to bearings/case etc. that the shaft holding gears is riding in. so cases/bearings stay in better shape. downside of straights is they're noisy, but hey, some people love it, sounds mean.

Guest · Post by **Guest** » Sat Apr 17, 2004 10:38 pm

check out the kennedy engineering web site, they have close to 100 different engine edapter kits to fit the vw transaxle.

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Other engine possibilities

Flipping R&P does not hurt anything...

helical straight cut gears