From knowing nothing to having a Thunderbird supercharger on an m20b27i

[Ether-D]

Just an observation, but I've been running this car with the supercharger for a full year now. Almost 15000 miles. I still can't believe it works.

[Andy.B]

Looking good!

[Ether-D]

Alright, the ball is rolling on this shit. It's 60 and sunny here in TN today. So I got the block painted and all the surfaces scraped and ready for their new gaskets. I also got the crank bolt out and removed the oil pump (shaft) pulley and crank pulley so as to remove the front seal carrier(?) and re-seal it.

[Ether-D]

Got an old stock, complete m20 gasket kit on Ebay from a guy in NY for $78 shipped. It even looks like it might be an Elring HG. I believe that is a steal.

[Ether-D]

It's time to get the knock outta my m20. As it progresses through time, the knock has gotten a bit worse. It knocks pretty loudly for about 10 revolutions on start-up. Oil light goes off, and it's nice and quiet until I'm just barely on the gas or when I'm lifting off the gas just before a shift, and it'll rattle back into perception.

So, I took a wire wheel to the b27 bottom. And some degreaser and some brake-clean. Gonna slap a nice thick coat of black paint on it in the morning. Time to order gaskets. Again. I think I've spent $400 on gaskets in the last 2 1/2 years. Bout to spend another , what, $100 again. It better last a while this time.

[Ether-D]

Some of you guys may have read posts here on r3v by a guy named Swanny and a guy named Andy.B. Let me just say that these guys are about the best kind of stand-up guys. I just had, delivered to me in middle TN, a whole m20b27 motor in fine condition. Andy.b in Buffalo didn't need it, Swanny was driving a car to TN for his brother from NY. Swanny put two and two together from reading my thread and offered to pick that shit up and bring it to me just because he could.

Btdubz, I had previously never met either one of these guys. Just on the inter web.

Sometimes I bitch about how many douchebags are on r3v. These two guys could singlehandedly make up for all of them.

Thank you Swanny and Andy.B. There is a lot of good left in this world.

[The Dark Side of Will]

Probably cost effective and 2.7 is plenty of stroke considering the engine stress you save there over a 2.8 or 3.0 can be refilled quickly with more boost. I'm sure that's partly why RB26s have shorter strokes than a 325i for example. Either way, you've inspired my E30 and now it wants to grow up to be a lot like yours.

Superchargers aren't as efficient as turbos. A 2.7 with more boost can match a 3.0 with less boost when the boost comes from a turbo. However, with the supercharger more boost isn't always the best option due to charge heating. You don't want to run an M90 much over 12 psi... so a 3.0 on 12 psi will make more grunt than a 2.7 on 12 psi.

Edit: Also an RB26 has ridiculous port flow compared to an M20.

[Ether-D]

Read through this thread and I've thoroughly enjoyed seeing how you've made this car work.

Question for when you build the bottom end, how do you currently feel about running super eta pistons w/ the eta rotating assembly to complete the 2.7 stroker? Since they only bump your compression up 0.1 compared to flat tops, it seems like it would still be advantageous to get the match with the combustion chambers even if you get that small increase. Or even run a taller head gasket and get same low compression with matched pistons and chambers.

Probably cost effective and 2.7 is plenty of stroke considering the engine stress you save there over a 2.8 or 3.0 can be refilled quickly with more boost. I'm sure that's partly why RB26s have shorter strokes than a 325i for example. Either way, you've inspired my E30 and now it wants to grow up to be a lot like yours.

Well, it's pretty damn easy to find an Eta bottom round here. Don't see many (any) super Etas at all. But I hadn't even considered combustion chamber matchiness.

It hasn't gotten quite that real for me yet. The damn thing keeps clacking-away and running just fine.

Also, thanks for your compliments. I think it's a worthwhile venture.

[whitebulat22]

Read through this thread and I've thoroughly enjoyed seeing how you've made this car work.

Question for when you build the bottom end, how do you currently feel about running super eta pistons w/ the eta rotating assembly to complete the 2.7 stroker? Since they only bump your compression up 0.1 compared to flat tops, it seems like it would still be advantageous to get the match with the combustion chambers even if you get that small increase. Or even run a taller head gasket and get same low compression with matched pistons and chambers.

Probably cost effective and 2.7 is plenty of stroke considering the engine stress you save there over a 2.8 or 3.0 can be refilled quickly with more boost. I'm sure that's partly why RB26s have shorter strokes than a 325i for example. Either way, you've inspired my E30 and now it wants to grow up to be a lot like yours.

[Ether-D]

It is a long read. Thanks for hanging in.
The manifold? I'd make you one for $1000. I really don't wanna though (hence the price).

It wasn't all that difficult, just very time consuming.

[Tri-Polar]

Man, i just spent ages reading this thread. All i have to ask is, how much for the manifold? :D

[Ether-D]

Yup this threads sucks...

It really does. No info in here. Move along folks.

[ajackz]

Yup this threads sucks....



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[Ether-D]

Yeah, I'm gonna have to, after feeling this thing breathing in the 20 deg air we've had recently. It really likes the winter...

[TheTacoMan]

You should meth that supercharger up.