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First does look a bit tall, it's about like 2nd on my VW, but I think a lot will depend on the low RPM tractability of the engine, and exactly how/where the car will be used. I didn't do the math for you, but ratio spacing looks reasonable by eyeball. You are generally looking for a decreasing...

My fwd transaxle is a VW manual shift (020) gearbox, so all power transmission, including final drive, is via conventional helical gears on parallel shafts. I'm convinced through reading that REM finishing does an excellent job in dramatically increasing fatigue life, and most probably...

Years ago a friend and I fitted an aluminum exhaust pipe to a Triumph Spitfire sports car. It was incredibly loud -inside the car - compared to the same system with a steel pipe. The only explanation we could come up with was that the much lower modulus of elasticity of the aluminum was...

TVP - Thanks! I've contacted REM for their tech info. An obvious fear re the REM data is that, given the large scatter of automotive dyno results, it is so easy to "cherry pick" an outstanding result. And no marketing department worth its salt would fail to do so, at least to some extent...

Has anyone seen objective data re driveline loss reduction via the so-called "REM" micropolishing of transmission or final drive gears? I've seen some claims that are kind of hard to believe, and wonder if anyone here has any actual data? I'm rebuilding a fwd transaxle for road racing and...

Sacem: I like the idea of mounting the reduction unit on the generator, that certainly eliminates the transmission loss variable. Depending on the inertia of the generator armature, how much you can gear it down and still absorb the power, and how happy your engine is at sustained high revs...

Well I guess I'm only half gullible, since I did type "supposedly" :) I did dimly remember the long and short ports, are they really as much different as the intake trumpet lengths in that photo? Some of the engine development was done here in Richmond, VA USA at the former Reynolds Product...

Long ago, road racing V8s with IR fuel injection often had long and short induction trumpets, which supposedly were for the purpose of broadening the power band. It pretty obviously would do that, at the expense of peak power. Whether it was optimum, I don't know, but they won a lot of races...

In my engineering school ME lab we had a dyno just as you described, a very old, very large DC generator (can't remember how many kW) mounted on bearings, connected to a big resistor bank electrically - and to a Toledo scale via a torque arm. My senior project involved testing a racing engine...

V114: If you're mostly looking for trends, either the regular or the plus version should do fine. The plus version is mostly convenience enhancements. If you're going to actually model your engine in detail, you might want to consider the pro version as mentioned by Ron Hamp. I think it's a...

V114: I'd like to toss in a suggestion. Why don't you get one of the available engine simulator software applications (available from www.performancetrends.com among others) and do a rough model of your engine. You can then play with a lot of variables and get a feel for how they interact. No...

Does anyone have knowledge as to the expected useful life of a Bosch wide-band O2 sensor used on a race engine running leaded fuel? I've heard everything from "a few minutes" to "several seasons of racing" and am thus totally confused. Assuming that there really is a huge range of life, I'm...

Oops, sorry, 2 gpm. Got me! Al

The applications engineer for Setrab Heat Exchangers gave a high side estimate of 2 gph, which surprisingly (to me anyway) gave a pressure drop of only 1.5 psi across a smallish (10 row) cooler, so it looks as if pressure drop is not a problem for me in this application. Thanks! (I'm still...

Can anyone give me a guesstimate of my lubricating oil flow rate to help me size an oil cooler and calculate plumbing system losses? Engine is a VW A1 (Rabbit, Scirocco) 1600cc 4 cylinder, 5 main brg, solid lifters, bearing clearances slightly bigger than std (~.002"), running SAE 30 or 50 oil...

FWIW - probably not much - my 1974 Mercury (ie Ford) Capri 2.8 V6 had a helical gear drive to the cam. It was a phenolic plastic gear with a metal center. I found this out when the phenolic part disintegrated abruptly one day at maybe 75,000 miles. No warning noise or erratic running, just...

What type vehicle? Racing or Street - if racing what kind? Is this an F.I. system with a return?

So it looks like the consensus view is: 1. Make the squish gap as tight as possible w/o mechanical damage from contact. 2. Make the squish area as large as possible except do not exceed ~50% of bore area. The VW head has vertical valves. Basic chamber layout is much like a wedge chamber V8...

I'm just starting to research building a racing engine. This is based on a 70s - 80s VW 8V watercooled (Rabbit, Scirocco, Golf etc.) engine. The class rules specify an 11:1 CR and an unmodified combustion chamber so the basic design is pretty fixed. A flat top piston with the right head milling...

Hello, new user here. I'm looking to update my 25 year old library on IC engines stuff. Interest is in general theory, racing engine design, and performance modifications. Any recommendations? Pardon me in advance if this info is available in an FAQ or by searching threads - I tried feebly...