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Old 02-20-2012, 02:15 PM   #1
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PCV OR NO PCV ??????????

hi i have a 93 lx hatch with a 5.0 gt40 lower /trickflow twisted wedge heads/crane cam /ford racing roller rockers /trickflow lwr and upper intake with a spacer/professional products t body/42 lb inj/255 pump/matching maf/anderson powerpipe/snows methonal inj/novi 2000 supercharger/ hd 5 spd 1st and 3rd changed /alum shaft 3.73 rears .now after all that my dyno guy said i should not run the pcv because it can cause detonation on a s/c motor/ i was thinking of an oil seperator and adding one more breather to the drivers v cover / i am running at only 10 psi boost and it sometimes blows the pcv out of ots grommet . has anyone run into this and if so what did you do for a remidy .any info would be apprec. thank you all
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Old 02-20-2012, 07:02 PM   #2
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Re: PCV OR NO PCV ??????????

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hi i have a 93 lx hatch with a 5.0 gt40 lower /trickflow twisted wedge heads/crane cam /ford racing roller rockers /trickflow lwr and upper intake with a spacer/professional products t body/42 lb inj/255 pump/matching maf/anderson powerpipe/snows methonal inj/novi 2000 supercharger/ hd 5 spd 1st and 3rd changed /alum shaft 3.73 rears .now after all that my dyno guy said i should not run the pcv because it can cause detonation on a s/c motor/ i was thinking of an oil seperator and adding one more breather to the drivers v cover / i am running at only 10 psi boost and it sometimes blows the pcv out of ots grommet . has anyone run into this and if so what did you do for a remidy .any info would be apprec. thank you all
I don't understand how he thinks it can cause detonation?


There are some changes to the PCV system that you will need to make.
Here is a diagram showing how to set it up.
What kind of power are you making?
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Old 02-20-2012, 07:18 PM   #3
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Confused.
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Old 02-20-2012, 07:23 PM   #4
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Re: PCV OR NO PCV ??????????

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Confused.
Dazed.
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Old 02-20-2012, 07:43 PM   #5
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Ahhh I see what you did there Trojan xD
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Old 02-20-2012, 08:18 PM   #6
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Re: PCV OR NO PCV ??????????

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Ahhh I see what you did there Trojan xD
Wasn't sure if anyone would know.
That movie is getting to be pretty old by now.
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Old 02-21-2012, 08:53 AM   #7
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Re: PCV OR NO PCV ??????????

i am making 470 rwhp on the last pull
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Old 02-21-2012, 09:08 AM   #8
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Quote:
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Wasn't sure if anyone would know.
That movie is getting to be pretty old by now.
It's still a great movie
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Old 02-21-2012, 09:09 AM   #9
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i am making 470 rwhp on the last pull
That's an awful lot for a stock block, are running a tray and griddle?
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Old 02-21-2012, 09:44 AM   #10
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Re: PCV OR NO PCV ??????????

5.0 can make up to 550 rwhp safely without a problem and for added strength i did add a valley girdle and a tray. as for the detonation on s/c and turbo cars as the oil vapors are returned via a pcv system in to the intake it will cause detonation by contaminating the air fuel mixture entering the cylinders when accelorating .it can also cause fouled plugs.oil build up on valves and injectors never mind the top of the pistons .s/c and turbo cars have increased crankcase pressures resulting in some blow by under hard acceloration
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Old 02-21-2012, 01:17 PM   #11
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I keep getting older they stay the same age.
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Old 02-21-2012, 05:07 PM   #12
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Re: PCV OR NO PCV ??????????

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i am making 470 rwhp on the last pull
Quote:
Originally Posted by rick978 View Post
5.0 can make up to 550 rwhp safely without a problem and for added strength i did add a valley girdle and a tray. as for the detonation on s/c and turbo cars as the oil vapors are returned via a pcv system in to the intake it will cause detonation by contaminating the air fuel mixture entering the cylinders when accelorating .it can also cause fouled plugs.oil build up on valves and injectors never mind the top of the pistons .s/c and turbo cars have increased crankcase pressures resulting in some blow by under hard acceloration
Nice power.
I'm shooting for 600 + with my Novi, starting with a base engine producing 405 HP at the crank.
P.S. the 5.0 stock block is good for up to 500-550 HP at the flywheel. Once you get that much power to the rear wheels you have gone past its capabilities. Tuning is ultra-important. More of them have died at below 500 HP than over. I have seen one of these first hand and it is not pretty. Nothing in the engine was reusable and it ruined the lower intake too.


I can see where the oil vapors being pushed directly back into the intake unfiltered/unseparated in large quantities could contaminate the air fuel mixture enough to cause detonation. For it to get to that level of contamination makes me wonder about how good the rings are? Like you said there will be "some" blow by, but enough to contaminate the air/fuel mixture that much seems excessive.


At any rate the diagram I posted should help you cure that issue, by removing most of the oil vapors from the vented crankcase fumes.
If that fails, then you can also use a smog pump to build a crankcase ventilation system.
If the blowby is not overly excessive the pump can greatly reduce or even bring your crankcase pressure down to negative values, which is ideal because it promotes better sealing for your rings and gaskets.


Since your build is very similar to what I have planned, I would appreciate any information and pictures you would care to share with me.
I am particularly interested in the pump specifications on the Snow methanol injection system.
I would like to know the flow rates, pressure and nozzle sizes they use if you would care to share that information?
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Old 02-24-2012, 12:10 PM   #13
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Re: PCV OR NO PCV ??????????

i will try to get all that info for you thanks
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Old 02-24-2012, 12:42 PM   #14
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Re: PCV OR NO PCV ??????????

Thanks, I'd appreciate it.
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