|Posted on Wednesday, February 23, 2005 - 10:53 pm: |
I have done a lot of research on this subject and I have looked at a lot of different engines even Motorcycle engines and Aircraft engines I haven't got much in the way of dimensions like valve cover to valve cover dimensions for the motorcycles but looking at the crank stroke most that I have seen are bigger than a stock Volkswagen crank which is 69 mm and that usually means that the valve cover to valve cover dimensions would be greater than a stock VW.I have found that the volkswagen engine is the most versatile of the ones that I have looked at I even looked at the Corvair engine which would be ok but I think that it would have almost too much power and it weighs more! You also have to look at fuel cunsumption, the Corvair even uses Volkswagen jugs since Corvair doesn't make them anymore. I even looked at the possibility of only using 3 of the corvairs 6 cylinders leaving one whole side off this would narrow the engine more than enough but might not have enough power to suit me. I was told this was something that snowmobile racers used to do but I haven't found any information about the subject on the internet. A stock VW engine is about 30 inches wide from valve cover clip to valve cover clip and can be narrowed. If you use a type 3 engine, from the bottom of the oil pan to the highest point on the engine is about 17 inches high. The
only drawback to the type 3 is they say that they don't cool as well as a bug engine type 1 but the bug engine is about 10 inches taller than the type 3 which were found in VW station wagons and fastbacks and I don't know what all else but a type 3 is now available in turn key form from GEX for about 2250.00 keep in mind that the engine mounts and cooling tins and carbs on this engine would have to be modified (because they stick out past the valve covers) along with who knows what all else. My idea is to move the carbs inward, trim the cooling tins and make my own engine mounts. This would be a must to get down to the approximate 30 inch valve cover to valve cover width I'm not exactly sure on the width it's kind of hard to measure by yourself. You can narrow the engine even more by enlarging the displacement of the VW This would be done by ordering 90.5 mm pistons called STROKER PISTONS they are an off the shelf item and would narrow your engine by about another half inch this would require machining of the block and you would have to have the jugs machined also. You could narrow the engine even farther by using shorter than stock connecting rods but this is very expensive since custom rods are about 800.00 for a set. Another option would be to use a smaller crank from a 1200 or 1300 cc engine I don't know the exact size of the crank about 64 or 65 mm this would help to narrow the engine a few mm but would decrease your displacement. I think one of the most challenging things about this will be to get the hot air out of the body it might not be as bad as I am thinking though. I was planning on using A VW transmission, but if you turned the engine side ways you could use a T-20 and then you might not have to do any mods to narrow the engine. but from what I have heard the belt slips with too much power at least I read the article about the guy who had the 3 or 4 cyl motor in his ATV It might have been the one with the Sprint motor.