[Fot] Fwd: Engine races

[Peter Popplewell]

I had a very similar problem to this on my TR6 after switching carbs from
Zenith to a pair of Hitachi-SUs off a Datsun 240z.  I swore I had more than
enough “return spring” on the throttle linkage, would work perfectly with
throttle blips in the garage with no load, but on the street it would
behave exactly as you’re describing.  I switched to much heavier return
springs and problem went away.

On Sun, Mar 29, 2020 at 7:25 AM fubog1 via Fot <fot at autox.team.net> wrote:

> Loosen the carb connecting clamp and make sure that both throttles are
> returning fully and against the idle stops, and then balance the airflow.
> Tighten the clamp and check it again.
> If both throttles are returning fully, and it still does it, you could
> have a loose or incorrectly centered butterfly, or a vacuum leak.
> HTH
> Glen
>
>
> -----Original Message-----
> From: Redmond via Fot <fot at autox.team.net>
> To: FOT at autox.team.net FOT at autox.team.net <FOT at autox.team.net>
> Sent: Sat, Mar 28, 2020 5:15 pm
> Subject: [Fot] Fwd: Engine races
>
> I sent this earlier today with a video.  I removed it and am trying again.
> Sorry for the double post if it comes thru.
> Todd
>
> ---------- Original Message ----------
> From: Redmond <alfetta95 at optonline.net>
> To: "FOT at autox.team.net FOT at autox.team.net" <FOT at autox.team.net>
> Date: March 28, 2020 at 11:59 AM
> Subject: Engine races
>
> Friends!
> Was a beautiful day for a drive yesterday in northern NJ.
> Problem is shortly after this video I was coming to a stop and when i
> pressed in the clutch the engine raced to 5-6k  I shut it down and pulled
> off the road.  This has happened before and we've done some things,  added
> a vacuum line, lubricated the linkage as we thought that the throttle was
> sticking, check the idle screw thinking it loosened(SU's).  I fired it back
> up and the racing stopped but the idle now was at 2300rpm.  We had it set
> to 1100rpm.  Drove it home, parked it and had a couple of pints!
>
> Any ideas or suggestions?
> Todd
>
>
>
>
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