It's alive!
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Joined: Mar 2000
Posts: 1,827
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From: FL
Originally posted by bjoern
The mounting holes in the Lightning TB had to be widened to 9mm (no biggie at all), they match just fine in all other respects. The only real problem is to mount the idle air control valve (IAC). With the L being a charged engine, the bypass air goes into the manifold, rather than just past the throttle bores, so the L TB doesn't have mounts for an IAC. What I did was having a machine shop make me a throttle body spacer (I think 2" thick) out of aluminum (the blueprints are on the page). I mounted the IAC on the spacer and used a U shaped piece of coolant hose from AutoZone or Napa with some plumbing fittings to route air from the rubber L intake elbow to the spacer. The spacer has two holes for the bypass air: one that is right between the two intake bores and is big enough to hit both bores with an opening, so the bypassed air gets evenly into the manifold. The other hole is basically L shaped and goes anywhere you can easily mount the plumbing nipple for the hose from the elbow - that's where the air comes in. Both holes are connected by the IAC.
Was that understandable? I'll try to take some close-up pictures to go with the blue-prints on the site.
The mounting holes in the Lightning TB had to be widened to 9mm (no biggie at all), they match just fine in all other respects. The only real problem is to mount the idle air control valve (IAC). With the L being a charged engine, the bypass air goes into the manifold, rather than just past the throttle bores, so the L TB doesn't have mounts for an IAC. What I did was having a machine shop make me a throttle body spacer (I think 2" thick) out of aluminum (the blueprints are on the page). I mounted the IAC on the spacer and used a U shaped piece of coolant hose from AutoZone or Napa with some plumbing fittings to route air from the rubber L intake elbow to the spacer. The spacer has two holes for the bypass air: one that is right between the two intake bores and is big enough to hit both bores with an opening, so the bypassed air gets evenly into the manifold. The other hole is basically L shaped and goes anywhere you can easily mount the plumbing nipple for the hose from the elbow - that's where the air comes in. Both holes are connected by the IAC.
Was that understandable? I'll try to take some close-up pictures to go with the blue-prints on the site.
. anyways, thanks for the idea, and GREAT job with the truck!
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Senior Member
Joined: Nov 2000
Posts: 161
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From: houston, texas, usa
Originally posted by Donate54
i also saw in your site that the machine shop charged you 350 for the spacer
i also saw in your site that the machine shop charged you 350 for the spacer
Senior Member
Joined: Jan 2002
Posts: 1,856
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From: New Orleans
I work at a restaurant, and the bar tenders boy friend owns a machine shop here. And I was talking to him and hes like "thats all you need? Ill get some scrap aluminum laying around the shop and do that for ya." I'm like how much, i told him about your $350 he was like that is outrageous, hes like i'll do it for free. I said thanks 
Senior Member
Joined: Mar 2000
Posts: 1,827
Likes: 0
From: FL
Originally posted by beastie
I work at a restaurant, and the bar tenders boy friend owns a machine shop here. And I was talking to him and hes like "thats all you need? Ill get some scrap aluminum laying around the shop and do that for ya." I'm like how much, i told him about your $350 he was like that is outrageous, hes like i'll do it for free. I said thanks
I work at a restaurant, and the bar tenders boy friend owns a machine shop here. And I was talking to him and hes like "thats all you need? Ill get some scrap aluminum laying around the shop and do that for ya." I'm like how much, i told him about your $350 he was like that is outrageous, hes like i'll do it for free. I said thanks