***UPDATE***

Cams have been confirmed to large for an SC setup by Jeremey Allen at Inline Pro. I will be purchasing and installing Ap2 cams.

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Ive done my fair share of engine swaps, sc boosted, and nitrous setups. So Im not some "noob" when it comes to engines, however Im not a mechanical engineer.

THE SETUP

ILP 2.4 Stroker Kit
ILP Sleeves
ILP 2.5x Head
ILP Stage 3 Cams
9.5:1 Compression
I purchased this engine with 5k miles on it from ILP employee who had a large turbo making 450-500whp.

SUPERCHARGER

SOT MP62 Positive Displacement Kit
Snow Performance Water/Meth Kit pre and post blower


THE PROBLEM
Im nearly finished my winter build and have just run into an issue with my cam setup aparantly. After recently contacting my tuner ( very well known and respected here in s2k community ) to get a base map and any recommendations by him for anything I should change or do. He suggested removing the ILP Stage 3 cams because I will lose "substantial power" as they are to large for my setup and swapping in OEM cams.

Im not doubting his insight into this sort of thing is greater then mine for sure. BUT Id like advice or input from the s2ki community on this as well. Can someone help explain this to me in more detail? I "might" try being a lab rat and swap the cams back and forth while getting tuned for the benefit of the community if its even worth while to do that.

Cams are Stage 3



Intake

Lift: .570" (14.47mm)

Duration@.050": 276°



Exhaust

Lift: .520" (13.20mm)

Duration@.050": 274°

 

My opinion is that he's referring to excessive overlap due to the long duration cams. Typically with PD superchargers you want to reduce valve overlap so that you don't bleed off the intake charge.

Since PD superchargers make their power by forcing more volume into the cylinders than you can at atmospheric pressure, having too much valve overlap will prevent the supercharger from filling the cylinder because the intake charge will go out the exhaust port if it's open.

 

To add, due to the efficiency of the mp62, people tend to expect power only in the lower rpm range and for the blower to be less useful at upper rpms due to excessive heat generation. Your cams actually favor high rpm use which runs counter to the best case use for the mp62.

Looking at the mp62 efficiency map, you want to avoid spinning these things too high unless you have a very good intercooler setup due to the low efficiency. Since you have a water/meth kit you can mitigate this somewhat but if you tune based on water / meth for power then you better be confident in the reliability of the kit because if it fails while your pushing the car hard, your gonna have detonation.

 

Last few points, with the low compression pistons, you will have more protection against detonation than a stock motor which is good.

What are the crank and supercharger pulley diameters? Since the kit was probably built with OEM cams in mind, I doubt you will get better performance unless you change the supercharger pulley from what came in the original kit.

This would be an interesting experiment nonetheless if your willing to try it out.

 

I've got a call into ILP and will here back hopefully today on Jeremey Allen's opinion. The pulley I will be using on the crank/supercharger pulley is the 155mm which will be over spinning the blower a bit but Im like you said hoping to offset this a bit with high amount of water/meth for cooling and timing. I will have all safety features available to me in place for the water/meth incase something happens. I appreciate your input!

 

Just got off the phone with Inline Pro and Jeremey Allen ( short response he was busy ) also recommended removing the Stage 3 Cams as they are to large for the amount of boost Im running with the blower ( superchargers in general ). I also asked about running just the stage 3 intake cam and the oem ex cam, he shot that idea down as well. SO I will be purchasing some oem cams asap because I sold my spare set from my other motor

 

very interested in the snow kit, and spraying before the supercharger.

 

The blower is to small for all that displacement, lower compression, and that crank pulley. Thing is gonna run out of steam way to early

 

Ahhh come on man! Haha I hope to prove you wrong we shall see to soon to tell. Far as I know Ill be the first to use the 2.4 with this sc kit. Ive got something else in motion I didnt list here for some extra hp juuuuust incase

 

I sounded like a hater. My bad. I want it to work. I really do. My experiences with that blower were not as good. I tried a 150 crank and didn't gain over a 145. I look forward to your results though. Now a 112ish sized blower would be nice. In vtec this motor is gonna want lots of air.