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88v8
Ivor Duarte
Gloucestershire UK
(1047 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Tightening torque, hunting idle
Posted by: 88v8
Date: July 28, 2023 09:52AM

Edelbrock 4bbl, manual choke....

The Rover V8 is still not running right since it came back all fouled up with ethanol and I cleaned it up .

At first it seemed OK hot and cold, but now it's still fine when hot, but not at all when cold. Started up this morning, air temp around 67F and the idle was hunting up and down between 1200 and 700rpm, or 1200 and stall, without me even touching the throttle.
Any idea what's going on?

If it's this bad in summer, it's going to be even worse in winter.

Another thing... tightening the carb onto the manifold I can't find a torque spec. The Edelbrock manual says 'snug' but one person's snug is another person's slack, that's why torque wrenches were invented....
I tightened the hold-down nuts to 60 in lb, is that enough?

Ivor


DiDueColpi
Fred Key
West coast - Canada
(1372 posts)

Registered:
05/14/2010 03:06AM

Main British Car:
I really thought that I'd be an action figure by now!

authors avatar
Re: Tightening torque, hunting idle
Posted by: DiDueColpi
Date: July 28, 2023 04:02PM

The Holley spec is 60 to 80 in. lbs. I would suspect the Edelbrock to be the same.
The hunting idle is generally a lean problem. Possibly some debris still in a transfer port or idle jet?


MGBV8
Carl Floyd
Kingsport, TN
(4524 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Tightening torque, hunting idle
Posted by: MGBV8
Date: July 28, 2023 04:45PM

I just snug them up by feel.


88v8
Ivor Duarte
Gloucestershire UK
(1047 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Tightening torque, hunting idle
Posted by: 88v8
Date: July 29, 2023 03:01PM

Snug by feel, yes but you might be Charles Atlas lol

I was afraid there might still be carp in there. Got fed up with the thought of stripping and cleaning it again, so I just bought a 1901 AVS to put on there. I can swap the tune.
It has an autochoke. Never had an autochoke, complexification, hmm we'll have to see how that goes.


MGBV8
Carl Floyd
Kingsport, TN
(4524 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Tightening torque, hunting idle
Posted by: MGBV8
Date: July 29, 2023 09:17PM

No one will mistake me for Charles Atlas, Ivor. :)

Snug up by feel, mechanic tight based the size of the fastener, etc.

I didn't have torque wrench for a long time. Generally only reach for it for the serious stuff, head bolts & such.


Spitfire 350
Phil McConnell
Perrysburg, OH (Toledo area)
(257 posts)

Registered:
01/11/2010 09:19PM

Main British Car:
74 Spitfire 350Chevy

authors avatar
Re: Tightening torque, hunting idle
Posted by: Spitfire 350
Date: July 29, 2023 10:46PM

Carburetors are tough to torque down because you seldom have a straight path to the bolts around the body. I tend to use the calibrated wrist snapping method to get them all equal.


MGBV8
Carl Floyd
Kingsport, TN
(4524 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: Tightening torque, hunting idle
Posted by: MGBV8
Date: July 29, 2023 11:46PM

Boxed end wrench. Do not overtighten. I have seen the mounting ears broken.



BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6471 posts)

Registered:
10/23/2007 12:59PM

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

authors avatar
Re: Tightening torque, hunting idle
Posted by: BlownMGB-V8
Date: July 30, 2023 08:36AM

If they are too tight the throttle shafts tend to bind.

Jim


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