Question about boost cam... help :)
Question about boost cam... help :) So I had a 408 stroker in my TA, cam size was 236/242 612/612 113lsa. Now I'm doing a 427 with a F1r blower, I got comp cams to Spec me a cam and they recommended a 227/235 614/621 113lsa. Is it necessary to get a smaller cam for boost? Would my 236 cam work with boost? My goal is to get close to 1k HP
try the first cam and see how it does. A lot of people run regular NA cams with boost. Look at what the sloppy mechanics use. They use the 228/230 off the shelf cam from summit.
Launching!
Joined: Jan 2018
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my understanding of the boosted cam specs is that with air being forced into an engine that already has pretty good inlet air flow, the exhaust flow lets it down. having lots of air coming in that the engine cant flow out causes back pressure which will kill any boosted LS.
so they reduce the amount of time the inlet valve is open (as a generalization) so the exhaust side can keep up.
given the air is coming in under pressure vs. only at a single atmosphere you'll find you'll have plenty of inlet flow even with the reduced duration. the extra lift on the exhaust will help get the gas out.
but I'd be confident your current camshaft will still not hold you back on power.
if it were my build I would run the current bump stick and see how it shapes up with the data from tuning
so they reduce the amount of time the inlet valve is open (as a generalization) so the exhaust side can keep up.
given the air is coming in under pressure vs. only at a single atmosphere you'll find you'll have plenty of inlet flow even with the reduced duration. the extra lift on the exhaust will help get the gas out.
but I'd be confident your current camshaft will still not hold you back on power.
if it were my build I would run the current bump stick and see how it shapes up with the data from tuning
The most basic reason to ever go smaller on a cam is to increase drivability. If you are ok with the current cam, there is no need to change it to a tiny bit different cam just for boost. Even the most extreme of NA cams will work with a blower or turbo of any type. They just won't be as drivable or efficient as possible. Decide if an almost not even noticeable difference in power and drivability is worth the hassle of a cam swap in your case. Then realize that if you have to (for some reason) build a new motor, then is the time to go with idealized components for the build.
