Compression

zach0 · 07-30-2004, 03:19 PM

I am going to be building a 351W blown for my 1980 Mazda RX-7. It's kinda of a Ford. I'm going to be using a Dart block and all Trickflow components from the crank on up so it will be a solid platform. I just am not sure on what compression ratios I should use. I want between 600-800 hp without nitros. I know it can be easily achivable with this setup. I haven't picked out a blower because I wasn't really sure whch one to select with all the different boost settings.

Also is a blower any better than a turbo cahrger?
What are the pros and cons between them?

Thanks

302man · 08-01-2004, 09:40 AM

If you decide to go blower, build your motor around a 8.5:1 or 9.0:1 ratio. Thats what most of the renegade guys build (me included). Vortech YSi is my recommended blower to use to make that kind of HP.

zach0 · 08-01-2004, 10:41 AM

What size engine are you using? Looking at 351 right now but may go to 302/347 with the 4 bolt main from Dart.

302man · 08-02-2004, 04:47 PM

My engine is a A4 , .060 bore with a 3" stroke. 310 ci . Don't look at the signature, I have a YSi on it now. I just need more track time to make it work.

07-30-2004, 03:19 PM	#1
zach0 Registered Member Join Date: Apr 2001 Location: Hampton, Virginia Posts: 227	Compression I am going to be building a 351W blown for my 1980 Mazda RX-7. It's kinda of a Ford. I'm going to be using a Dart block and all Trickflow components from the crank on up so it will be a solid platform. I just am not sure on what compression ratios I should use. I want between 600-800 hp without nitros. I know it can be easily achivable with this setup. I haven't picked out a blower because I wasn't really sure whch one to select with all the different boost settings. Also is a blower any better than a turbo cahrger? What are the pros and cons between them? Thanks __________________ 1980 RX7 with 289 Ford V-8 bored .030 over, Very radical cam, Torker 2 high rise intake, Holley 650 Carb, MSD Nascar 6ALN ignition, MSD coil and distributor, Headers with dual open side exhaust. Over 300 horse. 1966 Mustang still in progress

08-01-2004, 09:40 AM	#2
302man Registered Member Join Date: Jul 1999 Location: INDIANAPOLIS Posts: 404	If you decide to go blower, build your motor around a 8.5:1 or 9.0:1 ratio. Thats what most of the renegade guys build (me included). Vortech YSi is my recommended blower to use to make that kind of HP. __________________ old S trim combo 10.13@ 135 New YS combo = 680RWHP (no times)

08-01-2004, 10:41 AM	#3
zach0 Registered Member Join Date: Apr 2001 Location: Hampton, Virginia Posts: 227	What size engine are you using? Looking at 351 right now but may go to 302/347 with the 4 bolt main from Dart. __________________ 1980 RX7 with 289 Ford V-8 bored .030 over, Very radical cam, Torker 2 high rise intake, Holley 650 Carb, MSD Nascar 6ALN ignition, MSD coil and distributor, Headers with dual open side exhaust. Over 300 horse. 1966 Mustang still in progress

08-02-2004, 04:47 PM	#4
302man Registered Member Join Date: Jul 1999 Location: INDIANAPOLIS Posts: 404	My engine is a A4 , .060 bore with a 3" stroke. 310 ci . Don't look at the signature, I have a YSi on it now. I just need more track time to make it work. __________________ old S trim combo 10.13@ 135 New YS combo = 680RWHP (no times)

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