AirSpeed VW Community Forums

Technical => Engine Tech Forum => Topic started by: Bruce on September 16, 2009, 11:29:11 PM

Title: 411 engine vs Bus engine
Post by: Bruce on September 16, 2009, 11:29:11 PM

What are the differences between a 411 engine and a Bus Type 4 engine?  Is it just exhaust?

Title: Re: 411 engine vs Bus engine
Post by: BUSDADDY on September 17, 2009, 05:24:27 AM

Dipstick and oil filler location is different as well as compression, and of course all the tin and induction stuff.

Title: Re: 411 engine vs Bus engine
Post by: Bruce on September 17, 2009, 08:51:12 PM

Thanks for the good info.
Do you know what it takes to use a 411 engine in a Type 4 powered Bus?

Title: Re: 411 engine vs Bus engine
Post by: BUSDADDY on September 17, 2009, 09:56:19 PM

Depends on the year. If the bus is running L-jet the 411 heads have no hole for the temp sensor 2 and if it's a 79 the bus exhaust won't fit (square ports on a 79 bus).
The major issue with all of them is domed pistons where the bus runs dished, the bus has quite a few more pounds on a 411 and the high compression isn't helpful. They'll go in easy, the dipstick/filler isn't a serious PITA especially if the bus is 73+ with the hatch over the engine, but the heads won't last unless you deal with the compression as the temps get crazy.
I guess you could shim the barrels up a bit but pistons are really the long term fix, if it's an old engine you'll want to ditch the head gaskets no matter what as they are a recipe for trouble. You'll want to use the bus distributor too.