throttle linkage Help needed
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Lead Driver
Joined: Mar 2008
Posts: 7,175
Likes: 377
From: Near Los Angeles
throttle linkage Help needed
I changed engines, and now have a 300 inline. The old 390 had a 2v carb with rod linkage.
I now have an offy DP intake, with an autolite 4100 4v that sits 90 degrees to the engine, with the primaries closest to the engine. I have changed the accelerator pedal to the cable type, but need to make a bracket which will pull the throttle away from the engine, and allow me to attach return springs.
I was wondering if there are any aftermarket 'kits' for this. (highly doubtful) What cable do I start with?
If someone has been through this, can you please contact me with some photos. I'd really love to hear from you.
Post a reply, and I'll send you my email. Thanks.
I now have an offy DP intake, with an autolite 4100 4v that sits 90 degrees to the engine, with the primaries closest to the engine. I have changed the accelerator pedal to the cable type, but need to make a bracket which will pull the throttle away from the engine, and allow me to attach return springs.
I was wondering if there are any aftermarket 'kits' for this. (highly doubtful) What cable do I start with?
If someone has been through this, can you please contact me with some photos. I'd really love to hear from you.
Post a reply, and I'll send you my email. Thanks.
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
http://i144.photobucket.com/albums/r...Picture032.jpg
http://i144.photobucket.com/albums/r...Picture035.jpg
http://i144.photobucket.com/albums/r...1-17-07005.jpg
That is a 48" Lokar cable Lokar TC-1000HT48 - Lokar Throttle Cables - summitracing.com
I'm using a Spectre bracket and it works fine but I'm tinkering and changing to this Lokar bracket Lokar SRK-4001 - Lokar Throttle Cable Brackets - summitracing.com
Instructions here http://static.summitracing.com/globa...hrottlecab.pdf
http://i144.photobucket.com/albums/r...Picture035.jpg
http://i144.photobucket.com/albums/r...1-17-07005.jpg
That is a 48" Lokar cable Lokar TC-1000HT48 - Lokar Throttle Cables - summitracing.com
I'm using a Spectre bracket and it works fine but I'm tinkering and changing to this Lokar bracket Lokar SRK-4001 - Lokar Throttle Cable Brackets - summitracing.com
Instructions here http://static.summitracing.com/globa...hrottlecab.pdf
Thread Starter
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Lead Driver
Joined: Mar 2008
Posts: 7,175
Likes: 377
From: Near Los Angeles
Harte3
Harte3--
After checking out your photos, I was wondering about the plate you have on the bottom of your intake. What are the two pipes coming out? Is that vacuum? I thought that plate didn't go anywhere, and that I could leave it open.
Did you tap into the intake, and if so, why not use the two tapped ports for fittings?
After checking out your photos, I was wondering about the plate you have on the bottom of your intake. What are the two pipes coming out? Is that vacuum? I thought that plate didn't go anywhere, and that I could leave it open.
Did you tap into the intake, and if so, why not use the two tapped ports for fittings?
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Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
That is for water heat to the hot spot in the Offy intake. Those intakes were originally made to bolt to the stock exhaust manifold which provided the heat. Water is routed through that plate by means of a heater hose. With EFI exhaust manifolds or headers one loses that feature. The heat to the manifold provides for atomization of the A/F mix and helps prevent icing and bog in the carb. It also provides a more stable "climate" for the carb to operate in...heating in cold weather, cooling in hot weather.
Mine attached to the pedal just fine but it was a stock cable set up to begin with and not a conversion from a rod type linkage.
Mine attached to the pedal just fine but it was a stock cable set up to begin with and not a conversion from a rod type linkage.
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Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
http://i144.photobucket.com/albums/r...Picture027.jpg
http://i144.photobucket.com/albums/r...Picture026.jpg
There are some pics of the plate and fittings. A bit cleaner set up can probably be accomplished with the use of brass fittings but unless someone stands on there head in there, they won't see it anyway. A piece of 3/8-1/2 aluminum block is probably best giving one some "meat" to drill and tap for the fittings. I had a piece of thinner scrap and used it though with no problems. AbandonedBronco just made one for his vehicle and posted illustrations here recently.
http://i144.photobucket.com/albums/r...Picture026.jpg
There are some pics of the plate and fittings. A bit cleaner set up can probably be accomplished with the use of brass fittings but unless someone stands on there head in there, they won't see it anyway. A piece of 3/8-1/2 aluminum block is probably best giving one some "meat" to drill and tap for the fittings. I had a piece of thinner scrap and used it though with no problems. AbandonedBronco just made one for his vehicle and posted illustrations here recently.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
I had the same issue when I installed an Offy DP intake on my '79. I wasn't able to install a conventional throttle bracket because my AC box is very close to the carburetor and there is no room behind it. My throttle cable pulls from the front, instead of behind. Here are some photos of my setup:
If you're interested, I still have the drawings and dimensions of everything I made, and I can post them here. I think Harte has a really good setup and you should go for something along those lines if you can, but if you have an AC truck, mine is an alternative.
If you're interested, I still have the drawings and dimensions of everything I made, and I can post them here. I think Harte has a really good setup and you should go for something along those lines if you can, but if you have an AC truck, mine is an alternative.
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Distance from the heater box to the throttle linkage on different carbs may be a factor. I know that for me and the Holley's, it works. For the Edelbrock like fmc400 has, it may not and I certainly don't know about the 4100. Might have to mock it up with the engine installed and check before investing in cable/brackets.
Thread Starter
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Lead Driver
Joined: Mar 2008
Posts: 7,175
Likes: 377
From: Near Los Angeles
Harte3
In one of the photos it looks like you have 2 plates or spacers between the carb and manifold. Is that to clear the manifold with the linkage? Or is there another reason?
Thanks.
Thanks.
Thread Starter
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Lead Driver
Joined: Mar 2008
Posts: 7,175
Likes: 377
From: Near Los Angeles
cable confusion
I think what you're looking at coming thru the fire wall is actually the oil pressure gauge cable, or some other cable. Where the accellerator cable attaches to the pedal mechanism is not visible in the photo, nor does the cable ever go through the firewall. It is all in the engine compartment.
MSEE
Joined: Apr 2004
Posts: 10,386
Likes: 35
From: Austin, TX
My bracket sits on top of the intake runners, and it's secured using two bolts that go through pre-drilled holes that came with the intake. The holes are slighly in front of the carburetor mounting flange. The holes don't go through the runners, they're kind of to the side, if that makes sense. In my second photo you can see the matching holes on the base of my throttle bracket.