[Fot] Fwd: Engine races

[Robert Lang]

 Hi - Not for nothing, but sometimes we fix symptoms but the original problem is still there.
I would verify that the throttle shafts are not worn and that the butterflies close completely. As most of you probably know, with no load on an engine, it doesn't take much more than a crack of the throttle to see some wicked pissah (*) RPM's! I did an initial startup on a TR6 race motor with a Weber DCOE 40 that was stock on the idle screw - I saw 7000 on the tach as I shut off the ignition. It went to those RPMs in less than a second. Speaking of which - the idle stops on the stock DCOE40's SUCK. The metal is too thin for the screw contact patch and they wedge in there... makes syncing the carbs a real beyatch. But it also why I cringe or resort to profanity if an over zealous tech inspector tries snapping the throttles. But I got to build that motor... TWICE.

Regards,Bob Lang(*) W-P is a regional expression for superlative measure. 

    On Sunday, March 29, 2020, 8:40:00 AM EDT, Peter Popplewell via Fot <fot at autox.team.net> wrote:  
 
 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.HTHGlen
 
 
-----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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