[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [New Search]
> >> How much of a power increase is there going from a 1600 to 1641? The reason I >> ask is that I am weighing the option of adding 87mm pistions & cyl while my >> engine is apart. >> > Take a good look and you will notice that this is about a 2% increase in > displacement. If you buy the 87mm cylinders that can be just dropped in as > replacements for the stock 85.5mm ones then the cylinder wall will be, by > necessity, 0.75mm thinner all around. > > In the end, this thinning of the cylinder wall will more than make up for any > gain in displacement and the end result will be worse performance than stock. > This will not happen right away, but it will happen sooner than you will like. > 5-10k miles is typical. > I couldn't agree more. Gene Berg Recommended machine in 88s for the type 3 as they are so much hotter than a type 1. I'm going to take the chance and run thick wall 90.5s (and an 82 stroke) in my '69 fasty. If you have access to a machine shop, then I'd run the 88s for a mild increase in power. Are you keeping the stock fuel injection? if so I wouldn't tamper with anything else (and probably not the displacement either) because the injection is so sensitive to changes. Especially cam timing. If you're running carbs, then I'd recommend a mild cam, header, a good (read as Gene Berg) oil filter system and a counterweighted crank. Don't forget, if you increase the power, the weight of the pistons and the acceleration rate of the engine, then you're asking the crank to do way more than it was designed to. Good luck with the project, Kelly ------------------------------------------------------------------- Search old messages on the Web! Visit http://www.vwtype3.org/list/