When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
Changing the stroke of the engines crankshaft. Stock is 3.48" a 377/383 uses 3.75".
Thats the diameter of the circle the center of the rod journal(?) makes (so double the distance of the center of the main journals to the rod journals).
I just got off a LONG night at work, so I hope I explained that right...
Matt
so does a 383 have a higher compression ratio than a 350 then?> usually speaking i guess?>
not really, it depends on the piston you select, and the combustion chamber of the head, and the gasket thickness for the most part
For example, if i use a Felpro gasket of .038" thickness, and a 68cc AFR 190 head, i would select what type of piston i wanted to put my compression at around 10-10.5:1 so i could run pump gas.
so does a 383 have a higher compression ratio than a 350 then?> usually speaking i guess?>
Yes. With everything else being equal, the larger displacement will result in a higher cr. CR is the relationship between the cylinder volume at BDTC and at TDC. Increasing the bore by .03" increases the volume of the combuston chamber but the increasing the stroke from .348" to 3.75" increases the total cylinder volume by a greater amount. The end result is a higher cr. That's why dished pistons are readily available for 383's. The chamber volume of the heads also a major factor. Generally smaller chambers are preferable, and a dished piston is usually better than a flat or domed pistion, but the results can vary. Ultimately, a combination that gives up a little hp in exchange for more reliability and driving pleasure will be the better choice.
but still, why do u call it a stroker, just cuz it's bored? or does the stroke have to be a specific amount, or do u increase stroke? is is a stroker just a bored engine
I saw a kit to "de-stroke" a 350, why would someone want to do that? Doe sit put the power of the engine in a certain RPM range?
smaller stroke=engine likes to rev alot higher, like over 8000rpm with no problems
match that with a cam that makes all its power high in the band and youll have a nice little race car, but i dont think it really does you any good on the street
BMW's new Formula 1 engine revs to 19,000 rpm. I bet the stroke is less than 2". Shorter stroke=less distance=lower piston velocity=lower accelerations=lower forces, which allows for higher rpm allowed, resulting in more hp. That is how to get 850 hp out of a naturally aspirated 3.0L engine. Spin the crank 320 times per second. :crazy: