MG Sports Cars

engine swaps and other performance upgrades, plus "factory" and Costello V8s

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BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5284 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 340 upgrade
Posted by: BlownMGB-V8
Date: May 31, 2017 11:42AM

Looks like more slippage in the schedule. Ended up destroying the seal in the HTOB and since those are very unique and proprietary a google search on the seal number drew a blank.

SOo.... another $48 and a 3-7 day wait for another HTOB. That doesn't leave enough time for install and shakedown/tuning so the roadster will stay home this time. I'll bring it to Townsend instead. Too bad, I know a few were looking forward to the tech session. Guess we'll do Roadmaster A/C instead.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(3181 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
79 MGB, Buick 215

authors avatar
Re: 340 upgrade
Posted by: MGBV8
Date: May 31, 2017 02:18PM

Sorry to hear that, Jim. I know it has been a long time.


ex-tyke
Graham Creswick
Chatham, Ontario, Canada
(968 posts)

Registered:
10/25/2007 11:17AM

Main British Car:
1976 MGB Ford 302

authors avatar
Re: 340 upgrade
Posted by: ex-tyke
Date: May 31, 2017 09:10PM

Quote:
Ended up destroying the seal in the HTOB...

For such a high priced product, most HTOB's are overpriced, underperforming pieces of crap. An HTOB stopped me from going to British V8 2002 in Tennessee, so I can sense your disappointment - do yourself a favour and ditch the thing and go to an external slave cylinder.
Roadmaster will be more than suitable alternative.


rficalora
Rob Ficalora
Cypress, TX
(2336 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: 340 upgrade
Posted by: rficalora
Date: May 31, 2017 09:14PM

Jim - is there not time to make a bracket & use an external slave? Don't have to pull the engine for that.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5284 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 340 upgrade
Posted by: BlownMGB-V8
Date: June 01, 2017 11:16AM

Rob, it's worth thinking about. The biggest issue with using this OEM style HTOB is that you have to install and remove the T5 and bellhousing as a unit. This causes a lot of other problems, such as:

Cutting the fixed crossmember and fashioning a removable section becomes mandatory unless the engine is removed also.

Unless either the engine is positioned very far forwards or the engine mounts etc allow the engine to be greatly tilted to the rear, it is not removable due to the firewall. In most cases this will also mean unbolting the headers from the heads for transmission removal, and possibly unbolting the engine mounts. It may mean jacking up the front of the engine as well.

Access to the bellhousing/engine bolts is very difficult.

In addition, it requires careful selection of the pressure plate as it is incompatible with a high RPM bent finger diaphragm style PP. To get the same performance, a finger-weighted style such as CenterForce must be used, adding additional expense.

Then as Graham notes there is the quality. Upon removal of the seal I was able to inspect the bore and the shortcomings there are obvious. No deburring was done on the holes that lead to the bore for pressure and bleed, resulting in some very sharp edges in proximity to the seal. It looks rather clear that every time the seal bottomed in the bore these edges took a nibble out of the back outer edge of the seal, any one of which could have caused leakage.

And finally there is the fact that you cannot use this HTOB without an $80 input shaft bearing retainer which is difficult to source. Unless that is already on the transmission it is an additional expense.

---------------------------------------------------------------------------------------------------------------

Now to be fair, the alternatives are not perfect. Aftermarket HTOBs also do not allow the use of a bent finger PP. They have had quality issues. They generally have no anti-rotation provision aside from the hoses. And they are ridiculously expensive.

A mechanical TOB has friction, clearance, linkage and slave issues, but it will allow the use of the bent finger PP if room can be found externally. Usually this means a "pull" type cylinder, shortening of the clutch arm, and juggling of bore sizes to get something that works and feels acceptable. However, I'm willing to consider that possibility. A cable release arm such as used in the V6 Buick application would allow a rear mounted standard cylinder.

Jim


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5284 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 340 upgrade
Posted by: BlownMGB-V8
Date: July 12, 2017 09:19PM

So I got insurance on the car today and went for a couple of short drives down the street. Still have start-up and warm-up tuning to do and there's a squeak I need to find, but initial results are promising. It's got a lot of power and sounds awesome, the blower is putting out about 5psi which is what I was expecting.

I'll try to shoot a video next time I have family in town, probably the weekend of the Dayton meet. By then hopefully I'll have most of the shake-down done.

I haven't given up on the 8 speed, I recently learned that the TCM used in the 2014 and 2015 Cadillac CTS line might do the trick. Provided I can acquire a pin-out for the TCM connector and perhaps a schematic of the wiring for it. Not the easiest task. In the meantime the T5 will do nicely. I ended up using a S10 clutch fork and Isuzu slave cylinder and think it went together pretty good, not perfect but well enough.

Jim


Jim Stabe
Jim Stabe
San Diego, Ca
(602 posts)

Registered:
02/28/2009 10:01AM

Main British Car:
1966 MGB Roadster 350 LT1 Chevy

authors avatar
Re: 340 upgrade
Posted by: Jim Stabe
Date: July 12, 2017 10:55PM

Take that thing out and scare the crap out of the cameraman in the right seat. Hopefully, he/she will keep the video going so we can see it in action.



MG four six eight
Bill Jacobson
Wa state
(265 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: 340 upgrade
Posted by: MG four six eight
Date: July 13, 2017 12:04AM

Jim,

I can probably get the pin out and schematics for you. Due to copy right restrictions, most likely I will have to print them out and snail mail them to you though.

Bill


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5284 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 340 upgrade
Posted by: BlownMGB-V8
Date: July 13, 2017 01:20AM

That'd be great Bill!
I'll PM you.

Jim


mgb260
Jim Nichols
Sequim,WA
(1751 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: 340 upgrade
Posted by: mgb260
Date: July 13, 2017 01:17PM

Jim, Congrats! Take it easy starting out with the low gear first in that T5. You can probably start out in second.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5284 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 340 upgrade
Posted by: BlownMGB-V8
Date: July 13, 2017 03:37PM

... or 3rd. Or 4th.

Starting to drive it around a bit. Not happy with off-idle, I think I need to change the linkage geometry to get more movement initially rather than less, the way it is now. Feels sluggish but it really isn't, just not getting as much gas as the foot thinks it is. Guessed wrong there. It should be pretty easy to change. Mid throttle it has a lot of power. Also I think my off-idle tune needs some work.

Interestingly enough, with the 3.54 gears and the 25.7" tall tires, 1st gear is usable. Then around half throttle in 2nd breaks the tires loose. So I have some work to do with that.

In time I hope to have something I will enjoy driving but it may be awhile before I get there. Not quite like I can just pick right up where I left off with the 215. But the raw material is there, now I just have to refine it. There are a number of quibbles. Can't swear it'll be ready for Dayton but perhaps, and Townsend should be very possible.

Jim


rficalora
Rob Ficalora
Cypress, TX
(2336 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: 340 upgrade
Posted by: rficalora
Date: August 17, 2017 10:00AM

Hey Jim, you drove your car to a recent event, right? How'd it feel to have it back on the road?


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5284 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: 340 upgrade
Posted by: BlownMGB-V8
Date: August 17, 2017 10:56AM

Oh it was glorious! Driving a high powered MGB convertible in simply incomparable. (And I pity you GT drivers ;) )

Seriously though, I'm working my way through the shake-down and there is still quite a bit to do. But, the important parts are mostly done. Interesting to compare the roadster to the MG-Roadmaster though. Where the Roadmaster is infinitely civilized, the roadster is just something of a rampaging lunatic. Very controllable, but perfectly happy to simply go off at any instant. Once I get the rough edges ironed out I think I'm really going to like it a lot. Of course that could take awhile...

Jim
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