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Supercharging a 2.7

I'm starting to think about the motor. I have a '76 2.7, if I keep it I would like to put a supercharger on it in addition to EFI and a good ESM, etc. Anyone seen a supercharged 2.7 before? How well do they hold up after the usual problem areas are addressed?

Old 04-22-2016, 12:59 PM
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Been a while, but yes. There arent any readily available kits, so youd better be good at fabricating. A Buick roots style SC is a good choice to wake that 2.7 up down low and keep the power in the safe band. You really dont want to exceed 300HP on a mag case. You'd like see 250 HP with the aforementioned SC.

EFI and ECU control of the compressor clutch will be critical in making a motor that runs well and runs reliably. Good luck!
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Old 04-22-2016, 01:04 PM
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My target was for right around 300 hp. I can build a bracket or two and handle a serpentine belt setup, but casting or even welding a new intake might be beyond me. I'd also be running a meth/wter injection system fulltime so that may complicate the ducting but will definitely keep the detonation and heat at bay. Possibly a twin-plug thing too but only for keeping temps down.
Gonna be a long road though. At least another year.
Old 04-22-2016, 01:15 PM
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Twin plug is a given.
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Old 04-22-2016, 01:15 PM
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Thought as much. Block off the distributor and go with all-electronic timing? A twin-plug distributor runs as much as a good ECU does these days!
Old 04-22-2016, 01:19 PM
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^ truth

I run crankfire and coilpacks.
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Old 04-22-2016, 01:21 PM
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I like the coilpack idea. Probably going to use this compressor:
https://whipplesuperchargers.com/index.php?dispatch=products.view&product_id=336
Seems like the smallest package and most efficient.

Last edited by Mick_D; 04-22-2016 at 01:31 PM..
Old 04-22-2016, 01:26 PM
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Thought about a Paxton but a centrifugal SC doesn't make sense to me here performance-wise.
Old 04-22-2016, 01:32 PM
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For the 300 hp target, the centrifugal is a perfect fit. Very easy on the gearbox too. People are often so concerned with HP that they forget about the problems the extra HP brings. For a relatively modest goal of 300 HP, (which equates to low boost) I really dont see the need for the added expense of twin plugs. I ran a Paxton unit behind my 3.2 for years and it was awesome. Finally went turbo, which is a game changer, but as I said it comes with additional issues. Finally got the car tuned right after chasing down the appropriate MAF but still need to be careful with the 915 gearbox. I've run 8 to 10 psi BTW, single plug no problem.
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Old 04-22-2016, 05:38 PM
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My thought on the twin plug was that it runs cooler . I also thought that a Centrifugal compressor would have some of the same lag issues of a turbo. It would definitely be easier and cheaper to engineer...
Old 04-22-2016, 07:14 PM
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got told a centrifugal charger, when sized correctly, basically matches your N/A power curve.. there's just.. more of it.. would be kinder on the gearbox for sure?
have seen some cars with big ones fitted, and yep, all top end power.
Old 04-22-2016, 08:48 PM
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My experience with v8 motors is that roots type blowers spread the boost more evenly over the power curve than centrifugal blowers do.
Old 04-22-2016, 10:27 PM
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Far from an expert, but I would go for a centrifugal style as well. If not for performance characteristics, then for pwr delivery. I think the 2.7 engine and 915 would prefer cent. Tq delivery over roots or twinscrew.

Search for DPHans to see what turbo pwr he gets out of a 2.7
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Old 04-23-2016, 05:27 AM
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clutch-monkey you are absolutely correct. Just made the 3.2 feel like a 3.8. As far as lag goes there is none because its still a normal compression 3.2. Lag is almost a non issue nowadays anyway. When people mention lag they are probably thinking about the early 930's with ridiculously low compression. (which is what caused the lag)

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Old 04-23-2016, 12:16 PM
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