Ok i have finished looking thru a bunch of m90 pictures and port designs. I know some say that opening the outlet too much will decrease efficiency. IE the Lightning style outlet or when it is hogged out. if you look at the picture i attached, i think the design of the elongated outlet (like on the lightning) would actually be good and here is why. on both the stock and ported blowers on the right of the pic, you can see the raw casting where the rotors never touch the case. when air is pushed in this area, it has to find its way forward toward the main outlet. in the lightning outlet, this air can escape much easier. Another design idea for the outlet is to extend the outlet triangle to just before the point where the rotors are at their lowest. the idea behind this is that once the rotors begin turning upward instead of downwards or inwards, they are fighting against their own rotation. i feel this is the reason for the "silencer ports" as the rotors approach almost their lowest position in this area. the main outlet is where the rest of the rotor reaches its lowest point... well short of it...

I have a spare M90 from a 97 car i will practice on. but i feel my reasoning is sound. OK so thoughts and input please......

dyno the car regular then do you rport job and dyno again is the only thing i would suggest :] GL and i'm interested to see the results, i assume this wont work on a gen v due to the coating inside the s/c?

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BRAP BRAP BRAP nuff said

I wasthinkinh about this and as long as the lightning port doesn't go and over lap the.rotors where thecone together . So essentially you get the start of any compression . But don't loose any because it goes wider than the screws

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Just a random thought, but if making the opening that large worked well I would think the big venders would be selling them that way? Yet none of them do.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

Thats a good point.... still wouldnt hurt to try if you got a spare m90 laying around

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Sorry. But the vendors not doing something isn't reason enough for me to think it won't work. On my DOHC the vendors never ported the lower intake manifold... And even said it would hurt performance... I discovered they were wrong. My DOHC was .3 the faster then any other NA DOHC. It just makes sence to me... Even a 1/4 or 1/2" opening in that area should help allow air to move better and not effect the seal of the rotors.

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Florida Tuner
96 Z34 LQ1 14.81@92.2 P&P Intake/TB,3.73's,L67 injectors, UDP, 2.5" Exhaust
L36 Swap: 3.29's,SD hdrs,Ported: Topswap, N*TB, SLP 1.8RR, 105#, Si Valves

Don't get me wrong, I didn't say they do all that is right and good. Just saying it has probably been tried. I am curious as everybody else to see the results.

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2001 white gt coupe with enough crap to make it run mid 13's with 3 bad pistons
2002 40th GTP sedan mostly stock

i rember some one on clubGP porting one liek that it did nothing as you end up opening it up past the rotors

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92 LeBaron Convert: Turbo 3L 97 Grand Prix GT 4dr "Frankenstein": L67 4t65 swap
97 Grand Marquis: Summer DD 99 Grand Prix GTP: Top Swap Beater

Eaton R&D with huge amounts of money in flow testing, real and computer simulated >> DIYer engineering. Just saying. Go for it since you have one laying around, but I would suggest that you have some slightly better before and after's than you did with your ported LIM since a .3 second gain can be due to many other factors not even related to a ported LIM vs nonported.

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"

Eaton R&D with huge amounts of money in flow testing, real and computer simulated >> DIYer engineering. Just saying. Go for it since you have one laying around, but I would suggest that you have some slightly better before and after's than you did with your ported LIM since a .3 second gain can be due to many other factors not even related to a ported LIM vs nonported. Or better yet, get a GenV and clear gains over the GenIII

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Dubs:00 VW GTI VR6, Low and Slow 91 VW GTI 8v, Shave the Bay!! 91 VW Cabriolet 8v, bitch Basket
GP's:04 GP GT, Past now G-Ma's Girlfriend's 97 GP GT, "Project Pink Power"