If I'm building something that's supposed to be a "lightweight" track car, then ya, it really matters. 50-75 extra pounds hanging on the front of a car will make a noticeable difference in handling characteristics.
your right. i can tell you from a guy thats had many a d-series and b-series trannys on his chest that the b-series weigh more...at least 15-20 pounds more.
Yea, would .2 or .4 extra liters of displacement make it weigh 150-200 lbs more? lol doubt it. I'm not certain but it's got to be a very minimal weight different between the motors. Like others have said--it's probably more about the weight of the transmission.
true if utilizing stock components for handling every pound makes a differince, if placing a substancially heavier motor in the car then what it was originally designed for is your intent then remember they are for the most part designed to be balanced. aftermarket sespension can help adjust the displacement but deppending on the over all goal of the vehical it may not matter. IE utilizing say a k20 in a 90 civic, all be it over kill but sick if you can keep it to the ground for track car. the substancial weight differince would make it hard as hell for a DD. So OP what would be your goal for the car. if its a dd, you should be fine B or D. its when you look at pure preformance applications that it comes down to 100lbs= aprox .01 of a second.
Only about a 10-15lb difference in the trans. B's have larger blocks/heads (only the DOHC D's have B style heads which are deep with a shallow valve cover) an additional cam, larger cam caps, twice the LMA's, larger sleeves, etc.
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