Holden Monaro HT 308 Choke operation - Holden Technical Talk

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Fastlane » Holden Forums » Holden Technical Talk » Holden Monaro HT 308 Choke operation

Holden Monaro HT 308 Choke operation - Operation of choke

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MonaroZA		#1 Posted : Sunday, 1 June 2025 10:41:08 PM(UTC)
Rank: Newbie Reputation: Groups: Registered Joined: 7/02/2025(UTC) Posts: 5 Location: 2074 Thanks: 2 times		Hi. I'm trying to sort out how the choke works on the 69 Monaro 308 carby. Should there be a vacuum hose (or other?) connected to the choke or is it a bimetallic system. And can anyone tell me what carby it is? Thanks. https://ik.imagekit.io/2...?updatedAt=1748746070787


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HK1837		#2 Posted : Monday, 2 June 2025 9:55:18 AM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,851 Thanks: 1 times Was thanked: 539 time(s) in 514 post(s)		It a Rochester Quadrajet. The exhaust manifold on that side has a pipe through it and there is an insulated pipe that runs to where the arrow is pointing to. The other end runs up to the air cleaner so it is clean air. I'll edit this post and attach some images of my HJ, same engine. Note you can buy the pipes aftermarket in stainless ready to go with insulation. That is what is on those images of my Premier. Edited by user Monday, 2 June 2025 10:20:19 AM(UTC) \| Reason: Not specified
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MonaroZA		#3 Posted : Wednesday, 4 June 2025 3:07:00 PM(UTC)
Rank: Newbie Reputation: Groups: Registered Joined: 7/02/2025(UTC) Posts: 5 Location: 2074 Thanks: 2 times		Thank you to member HK1837 for a description of the heating system of the TetraJet choke system. I've decided to replace the exhaust-heated mechanism with the electrically-heated unit. Now I'm wondering how to shut off the vacuum from the carb used to suck heated air in the pipe passing the exhaust pipes? Has anyone does this conversion before?


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Smitty2		#4 Posted : Thursday, 5 June 2025 8:30:16 AM(UTC)
Rank: Member Reputation: Groups: Registered Joined: 6/07/2019(UTC) Posts: 403 Location: bayside Melbourne Thanks: 240 times Was thanked: 32 time(s) in 32 post(s)		Originally Posted by: MonaroZA Thank you to member HK1837 for a description of the heating system of the TetraJet choke system. I've decided to replace the exhaust-heated mechanism with the electrically-heated unit. Now I'm wondering how to shut off the vacuum from the carb used to suck heated air in the pipe passing the exhaust pipes? Has anyone does this conversion before? vac cap or plug... is what I use with electric choke conversions on Quaddies
		Club circuit racing...the best fun you can have with your pants on


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HK1837		#5 Posted : Thursday, 5 June 2025 12:35:03 PM(UTC)
Rank: Veteran Reputation: Groups: Moderator, Registered, Veteran Joined: 1/03/2005(UTC) Posts: 14,851 Thanks: 1 times Was thanked: 539 time(s) in 514 post(s)		Originally Posted by: MonaroZA Thank you to member HK1837 for a description of the heating system of the TetraJet choke system. I've decided to replace the exhaust-heated mechanism with the electrically-heated unit. Now I'm wondering how to shut off the vacuum from the carb used to suck heated air in the pipe passing the exhaust pipes? Has anyone does this conversion before? The vacuum source is under the carby, just above the smaller hole, look in the first pho below. Mine had that choke operator removed and a dirty Holley on it, they'd jammed a lead ball into the hole, you can see the ball where I removed it in the first photo, sitting on the carby mount face. The larger hole is threaded, a bolt holds the choke operator on. Just remove the choke operator and plug the hole with a lead ball or even a bit of Araldite or similar epoxy.
		_______________________________________________________ If we all had the same (good) taste, who would buy all the Fords?


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