The Ford Barn

flssaturday · 09-05-2017, 03:56 PM

Doing a twin turbo setup an a 49 merc 8cm. Any advice or idea's on what internals ate needed to handle boost.
Piston bore,intake valve size,exhaust valve size,gppd came . Ect.thanks

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woodypecker · 09-05-2017, 04:28 PM

forged pistons, low timing, low compression, very high octane, and good luck.

flssaturday · 09-05-2017, 05:04 PM

Thanks will post thread as build goes on.

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40 Deluxe · 09-05-2017, 05:13 PM

Where did you find the small turbos you need?

flssaturday · 09-05-2017, 05:15 PM

I found a kit ebay.

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JSeery · 09-05-2017, 05:30 PM

Sponsored Links (Register now to hide all advertisements)

There is a lot of information out there on supercharging flatheads. I would think a lot of it would be similar.

rotorwrench · 09-05-2017, 06:43 PM

Twin turbos can equal twice the headaches. Makes for a very busy engine compartment and exhaust system. I had enough troubles with only one on the old 47G3 series helicopters. When it is all working right it will make the engine breath but it takes a while to get over the turbo lag. The little ones spool up faster but they don't pump as much either. It will still have some lag. Would be Ok on the long dry lakes though. For street, it's hard to beat the roots type supercharger. Be prepared to spend a LOT.

Bruce_MO · 09-05-2017, 06:48 PM

You might want to contact Jack Stirnemann in St. Louis. He built a twin turbo flathead a few years ago. He and his brother Harry can do amazing stuff with flatheads.

flssaturday · 09-05-2017, 07:48 PM

Thanks will try him

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paul2748 · 09-05-2017, 07:55 PM

Maybe a girdle for the bottom end?

flatheadmurre · 09-05-2017, 08:24 PM

Depending on what power you aim for steel main caps and if they are oilcooled perhaps a higher flow oilpump and an oilcooler.

1930 turbo · 09-06-2017, 08:02 PM

Hit the search link at the top of the page and type in twin turbos. I posted my homemade setup setup back in April. You don,t need larger valves, stock compression is low enough, and we usually run premium gas. It will run o.k. on regular if you don,t run it hard. I limit the boost to 5lbs. You will like the way turbos make that Merc engine run! Good Luck!

flssaturday · 09-06-2017, 09:08 PM

Thanks!! Will look.

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VeryTangled · 09-06-2017, 10:19 PM

Have fun with some photos...

https://www.google.com/search?rlz=1C...h=588&dpr=1.56

09-05-2017, 03:56 PM	#1
flssaturday Junior Member Join Date: May 2017 Posts: 5	Twin turbo flathead Doing a twin turbo setup an a 49 merc 8cm. Any advice or idea's on what internals ate needed to handle boost. Piston bore,intake valve size,exhaust valve size,gppd came . Ect.thanks Sent from my SM-N910P using Tapatalk

09-05-2017, 04:28 PM	#2
woodypecker Senior Member Join Date: Jun 2012 Location: Clarkston, Michigan Posts: 239	Re: Twin turbo flathead forged pistons, low timing, low compression, very high octane, and good luck.

09-05-2017, 05:04 PM	#3
flssaturday Junior Member Join Date: May 2017 Posts: 5	Re: Twin turbo flathead Thanks will post thread as build goes on. Sent from my SM-N910P using Tapatalk

09-05-2017, 05:13 PM	#4
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,779	Re: Twin turbo flathead Where did you find the small turbos you need?

09-05-2017, 05:15 PM	#5
flssaturday Junior Member Join Date: May 2017 Posts: 5	Re: Twin turbo flathead I found a kit ebay. Sent from my SM-N910P using Tapatalk

09-05-2017, 05:30 PM	#6
JSeery Member Emeritus Join Date: Nov 2012 Location: Wichita KS Posts: 16,132	Re: Twin turbo flathead Sponsored Links (Register now to hide all advertisements) There is a lot of information out there on supercharging flatheads. I would think a lot of it would be similar. Last edited by JSeery; 09-05-2017 at 05:49 PM.

09-05-2017, 06:43 PM	#7
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,436	Re: Twin turbo flathead Twin turbos can equal twice the headaches. Makes for a very busy engine compartment and exhaust system. I had enough troubles with only one on the old 47G3 series helicopters. When it is all working right it will make the engine breath but it takes a while to get over the turbo lag. The little ones spool up faster but they don't pump as much either. It will still have some lag. Would be Ok on the long dry lakes though. For street, it's hard to beat the roots type supercharger. Be prepared to spend a LOT.

09-05-2017, 06:48 PM	#8
Bruce_MO Senior Member Join Date: May 2010 Posts: 433	Re: Twin turbo flathead You might want to contact Jack Stirnemann in St. Louis. He built a twin turbo flathead a few years ago. He and his brother Harry can do amazing stuff with flatheads.

09-05-2017, 07:48 PM	#9
flssaturday Junior Member Join Date: May 2017 Posts: 5	Re: Twin turbo flathead Thanks will try him Sent from my SM-N910P using Tapatalk

09-05-2017, 07:55 PM	#10
paul2748 Senior Member Join Date: May 2010 Location: Midland Park, NJ Posts: 3,982	Re: Twin turbo flathead Maybe a girdle for the bottom end? __________________ 48 Ford Conv 56 Tbird 54 Ford Victoria

09-05-2017, 08:24 PM	#11
flatheadmurre Senior Member Join Date: Apr 2015 Location: Sweden Posts: 3,045	Re: Twin turbo flathead Depending on what power you aim for steel main caps and if they are oilcooled perhaps a higher flow oilpump and an oilcooler.

09-06-2017, 08:02 PM	#12
1930 turbo Junior Member Join Date: Feb 2012 Location: Corry, Pa. Posts: 7	Re: Twin turbo flathead Hit the search link at the top of the page and type in twin turbos. I posted my homemade setup setup back in April. You don,t need larger valves, stock compression is low enough, and we usually run premium gas. It will run o.k. on regular if you don,t run it hard. I limit the boost to 5lbs. You will like the way turbos make that Merc engine run! Good Luck!

09-06-2017, 09:08 PM	#13
flssaturday Junior Member Join Date: May 2017 Posts: 5	Re: Twin turbo flathead Thanks!! Will look. Sent from my SM-N910P using Tapatalk

09-06-2017, 10:19 PM	#14
VeryTangled Senior Member Join Date: May 2010 Location: (Not far enough...) Outside of DC Posts: 3,387	Re: Twin turbo flathead Have fun with some photos... https://www.google.com/search?rlz=1C...h=588&dpr=1.56 __________________ -Jeff H Have you thought about supporting the Early Ford V-8 Foundation Museum?