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MGB-GT HRG Derrington Heads

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billspohn

billspohn

Jedi Knight
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I may have posted this here before, but for any new guys that are playing with alloy crossflow heads, or thinking of it, this may be of some use.

The main emphasis is on the original heads manufactured from the 50s - these are the ones that are legal for vintage racing in most groups, but it applies to all of the heads, new and old.

There is a lot of historical information as well as copies of the original period HRG material including fitting instructions.

HRG DERRINGTON

tvrsmall.jpg
 
WIRE that dial-a-pressure regulator down, Bill! /bcforum/images/%%GRAEMLIN_URL%%/devilgrin.gif
 
The regulator, and engine is now running the European circuits, so not my worry.

FIW I never had any problems with it but then I usually applied a bit of racers tape....
 
Jeff has it right. I've had those things "self-adjust", leak, downright SPEW... Baad Ju-ju. Hateful POS, IMHO.
 
I've said it before. I know exactly how far I can throw one of those! /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
I've seen them self destruct and cause a catastrophic fire.
But, Bill, as you say, it's not your worry.
Jeff
 
Interesting Jeff.

What you definitely CAN get problems with are those 'sock' filters - if they ever get wetted with fuel or oil and you get a backfire, you can start a nice fire, so you have to change them routinely. I'd toss mine every season, or more often if they encountered flammable liquids. I don't use them on the Twincam, but I ran open (i.e.no) inner fenders on the TVR and needed something to keep the gravel out.....
 
I agree on the sock type filters, Bill. I did the same regarding replacement when I ran them.
All my fuel regulators have long been Holleys. I still have one of the dial type on the track day Fiat, (it was there when I bought it) but have a Holley replacement that will be installed prior to starting the engine again.
No air filters as of yet on the twin 40mm Mikunis. I'll have to work something out there, too.
Jeff
 
Bugeye58 said:
I've said it before. I know exactly how far I can throw one of those! /bcforum/images/%%GRAEMLIN_URL%%/grin.gif
I've seen them self destruct and cause a catastrophic fire.
But, Bill, as you say, it's not your worry.
Jeff
Click to expand...
(laughs to self) There's one of those regulators somewhere in the woods behind my old property in Louisiana. I never knew I could throw anything that far!

Using a manometer, I never seemed to be able to effect a change in pressure with those dime-store regulators. It amazes me that they're still on the market.

I'm with Jeff on the Holley regulator:

IMG_6654.jpg
 
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