Engine and Transmission Tech

tips, technology, tools and techniques related to vehicle driveline components

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mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 18, 2017 10:33AM

Rob, Is your Edelbrock the 4 barrel type or front throttle body? Do you know the injector size? Stock 302/5.0 was 19lb. Most use 351 size 28lb.


rficalora
Rob Ficalora
Cypress, TX
(2389 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: rficalora
Date: November 18, 2017 10:42AM

Jim, the ProFlo is port injection. Throttle body is 4-barrel type with 1000 CFM # 1.5" hg. Injectors are 29lb Pico type.


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 18, 2017 10:51AM

Rob, a few more questions. Average runner length and port height. Then I can input custom and get a closer dyno chart. It sounds similar to what we did for Chris Gill on his stroker Buick. I think your B cam advanced is the best choice. Why buy another that is close to the same performance?



Edited 1 time(s). Last edit at 11/18/2017 10:53AM by mgb260.


rficalora
Rob Ficalora
Cypress, TX
(2389 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: rficalora
Date: November 18, 2017 02:28PM

Can't seem to find that info online and am away from the parts till sometime next week so won't be able to measure till then. I vaguely recall reading somewhere that the Pro Flo intake is based on the Victor Jr. but not 100% sure if my memory is right.


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 18, 2017 03:13PM

Rob, Thanks. I'll figure it out.


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 18, 2017 04:10PM

Rob, I used the Victor Jr settings in my program. Looks like over 40HP over carb simulations. Still about a tie but Comp cam may idle better due to lower duration. You can see that the Victor Jr intake wakes up at 3000RPM.
Edelbrock Pro Flo B303 001.jpg
Edelbrock Pro Flo Comp XE264HR 001.jpg


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 19, 2017 10:23AM

Rob, Your cam has 5 degrees advance built in. The Comp cam has 4 degrees advance built in. Even though they are put at zero the advance is already there.



mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 19, 2017 12:20PM

Dan Masters uses the E cam with his Edelbrock Pro Flo injection. A little less duration and more lift than the B cam.


rficalora
Rob Ficalora
Cypress, TX
(2389 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: rficalora
Date: November 19, 2017 06:01PM

I knew Dan has an E cam and he is happy with it. But, if I'm going to swap cams, the XE264 or 266 seem like better choices. Either way, I'm going to try it with my existing cam. I'm just not sure how well the EFI system will like it.


mgb260
Jim Nichols
Sequim,WA
(1811 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: mgb260
Date: November 19, 2017 06:19PM

Rob, I agree with the XE264 but the higher lift on the XE266 makes me worry about piston to valve clearance, for a small gain in power.


kstevusa
kelly stevenson
Southern Middle Tennessee
(818 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: kstevusa
Date: November 19, 2017 07:38PM

From my experience, the XE 264 HR is perfect for a EFI street car. As Jim noted earlier, the carbed and EFI Dyno very close. Larry Shimp and I confirmed this several times. Same engine combo, Carb vs EFI. No P to V problems. E & B Cams= OLD School Tech. OK to move up to early 21 Century tech. :-)


MGBV8
Carl Floyd
Kingsport, TN
(3235 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: MGBV8
Date: November 20, 2017 06:37PM

B-B-B-B-but Kelly.......





Edited 1 time(s). Last edit at 11/20/2017 06:38PM by MGBV8.


rficalora
Rob Ficalora
Cypress, TX
(2389 posts)

Registered:
10/24/2007 02:46PM

Main British Car:
'76 MGB w/CB front, Sebring rear, early metal dash Ford 302

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: rficalora
Date: November 20, 2017 07:48PM

Yeah, yeah Carl... Kelley already sent that to me to harass me. You guys have convinced me. Need to swap transmissions and resell my current one before I can buy a cam.



Edited 1 time(s). Last edit at 11/20/2017 07:49PM by rficalora.


kstevusa
kelly stevenson
Southern Middle Tennessee
(818 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: kstevusa
Date: November 20, 2017 07:51PM

Carl, that video "kills me", LMAO


MGBV8
Carl Floyd
Kingsport, TN
(3235 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: MGBV8
Date: November 21, 2017 05:59PM

I know. It's a riot! :)



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5354 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: BlownMGB-V8
Date: November 22, 2017 12:01PM

brings a tear to my eye...

Jim


kstevusa
kelly stevenson
Southern Middle Tennessee
(818 posts)

Registered:
10/25/2007 09:37AM

Main British Car:
2003 Jaguar XK8 Coupe 4.2L DOHC/ VVT / 6sp. AT

authors avatar
Re: Gear ratio calculator, rear gears, and transmission ratios
Posted by: kstevusa
Date: November 22, 2017 04:41PM

M.F!, never thought of using a B cam for "Tenderizer" Other good attributes including the Aliens and Mother Ship. Is there anything the Mighty B Cam cannot do????? Insert where?
Happy Thanksgiving to all!
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