Quote:
Originally Posted by RICK LAKE
xb-60 Glen Look at this from another side, what are you doing with the car?? shows, racing, autocross, roadcourse, or just street driver. Here are a couple of questions that will deceide what valve train to use also
Rpm limit and range of motor?
Motor size?
Amount of work done to heads and compression of motor
A BIGGIE Exhaust system, under car, side pipes,(street or race pipes) size of pipes?
Trans mission, how many gears, rearend ratio?
Top speed you like in your comfort zone?
Answer these question and we can come up with a good setup for the application.
there are plusses and minusses with running each valve train you have listed. I think most goods and bads are there. IMO a complete roller valve train is the first step. Matching the rest of the parts to this is important for power, sound,duribility, and even gas mileage too. I run a hydro setup for 6 years and race. No problems after getting Erson rockers. Limit of motor is 6,200 rpm with hydro crane roller lifters. A also run Beehive springs going on 12 years without any failures from BBC motors. I build torque motors not high RPM HP motors. 2 thing that are a no-no with a solid setup are idling the motor for any period of time and not check valve lash and keeping note on which ones needed adjustment. Fill in the questions and see where we go with parts and setup. Rick L. ps look at some of the buildup of your motor size for other ideas. DON'T get glassy eye with some of these dyno sheet in the rag/mags. They get a little over the top with numbers. Rick L.
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The car doesn’t exist yet, and the engine doesn’t exist yet…..but it definitely will eventually. So, I’m in the planning / gathering information / theorizing / gathering bits stage, with folders filling with information. One of the larger ‘bits’ is the engine, hence the question about things like lifters.
Here are my thoughts about what I want in an engine, and these are idealistic:
Vintage appearance 302, with stock capacity except for cleanup overbore
Intended use is street
RPM range is 2000 to 7000. I want reasonable (but not stump-pulling) torque at the lower end to suit my preferred diff ratio, and that free-revving feeling at the top end. Target power and torque figures aren’t that important, as the power-to-weight will be good, no matter what the power is.
Heads would preferably be CI for authenticity, but I’m also persuadable towards alloy heads.
Exhaust will need cats, will be undercar but both pipes exiting ahead of rear wheel on driver’s side; pipes sized to suit engine, not eye.
Gearbox will be a WR Toploader
Diff ratio will be 3.07:1
Top speed? Not important.
Reasonable cost
Fuel consumption not excessive, however this is low down the list as annual mileage will be low.
I should also add that emissions tuneability may, or may not, be an issue. Let’s say at this stage it’s not an issue.
Webers, as this is a wish list.
Thanks for your interest,
Cheers,
Glen