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SVT Performance (2002-2004) The place to chat about any 2.0L SVT DOHC Zetec engine performance, tuning and exhaust related upgrades.

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Old 04-12-2013, 09:37 PM   #21
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Quote:
Originally Posted by teamDFL View Post
Short answer - PV=nRT

Long answer - Because it won't work that way. It is a positive displacement blower so it moves the same amount of air each revolution. So unlike a compressor, boost is nothing more than a measure of restriction after the blower. Boost causes higher drive losses and, more importantly, more heat. As you well know, that is the last thing a JRSC needs. For a roots blower, unless you go too far with the overlap and are therefore wasting energy, you want the highest power at the lowest boost level. This is why cams for roots blowers aren't the same as they are for compressors. If you add cams and lower the boost level, you will gain power from the loss in heat build, at the very least.
No... The SC is still turning the same amount or RPM = same volume , same heat just less manifold psi because the engine is taking in more air and the SC can nolonger keep up , your explanation is for engines / SC in general not the crappy 2.0 zetec jrsc

I know your going to say less psi = less heat and In my opinion no because the jrsc creates a hugh amount of heat even with lower boost

Some will say to go more boost adding a pully and then your adding more heat which means less timing which means less HP

Theres no way to win this with a jrsc there undersized for the 2.0 Zetec engine

In my opinion it would be a waste to add cams with the jrsc

Tom
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Old 04-13-2013, 05:44 AM   #22
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No... The SC is still turning the same amount or RPM = same volume , same heat just less manifold psi
Well, Eaton who makes the blower, and physics, which sets the rules, disagrees with you. Heat increases with boost. This is an absolute. Whether or not the heat level is problematic at both the higher and lower boost is open for discussion, but the fact that more boost = more heat is not, no matter what you say.

Plus, he is talking about an SVT JRSC, not the regular Zetec one.
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Old 04-14-2013, 11:50 AM   #23
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SVT jrsc is just as bad if not a little worse , yes more boost = more heat but in the jrsc case less boost does not mean less heat

I never said more boost didnt mean more heat , please read again , the heat is problematic sure it would be

Take into account the less boost , heat adding cams wouldnt gain you the amount of HP gains worth the cost in my opinon

Tom
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Old 04-14-2013, 12:02 PM   #24
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As much as I would like to put all this to the test. Sounds like the bang isn't worth the buck... So guess ill stick to my Gt3071r

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Old 04-16-2013, 01:08 AM   #25
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Another reason to not run those cams with the PD blower is the duration split favors the intake, good for turbo but the opposite of what you'd want for a blower. You'd end up with a ton of heat in the chamber and have that (H)eaton blower heatsoaked after a couple of seconds. Stock cams would be a much better choice.
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