My draw through turbo

[sideshow]

Probably power brake vacuum source.

[advinnie]

Cheers mate I’ve still not found out what the hole is for but I will continue looking

[buguy]

Have you taken the plug out to see if it's just open to the manifold? If it is then it's simply a vacuum source.

[Chip Birks]

Definietly not preheat there. Thats usually under the manifold. Looks like a hole for a temp sensor, or water injection or something.

[advinnie]

Took the plug/bolt out and it’s just a straight hole that goes into the manifold air stream

[advinnie]

Here’s a link to the latest video of my 1600 draw through turbo bug now I’ve replaced the broken piston and cylinder and now with a slightly different exhaust
https://m.youtube.com/watch?feature=you ... 9qoJm3nsvA

[buguy]

Sounds tough!
She loading up a little at idle? Do you know your AFR?

[advinnie]

She was loading up but I’ve sorted that out now. I had a bad needle valve and it was not shutting of the fuel that well and was slowly flooding the engine when at idle so changed it and all’s good. Yes I have a lm-2 hand held reader but it’s just reading 100% rich at idle (8.5:1)

[buguy]

Well I love the way a draw through sounds so I'm biased. I love that crackle! I have been working on that with my 4 barrel. I'm not sure if it's better to have it a bit leaner at idle to save from carbon monoxide poisoning and in case of a traffic jam and have to fatten up quicker as it builds boost, or to just run it around 12.5 or so and less risk of a lean spike. I guess it's all about experimentation.

[advinnie]

I’m planning on running it slightly rich to play it safe for the moment. I’m seeing 14.1:1 on a cruise and at WOT no boost I’m getting a reading of 13.0:1 and WOT @ 8 psi I was seeing 12.4:1 but as soon as she starts to idle I get a reading of 8:1

[buguy]

Sounds like you have it running pretty well besides the idle. I wish I could help but I have never touched one of those carbs.

[WickedWagens]

That exhaust sounds great!

[advinnie]

Cheers mate.
I do have one small problem I need to sort out and that’s it now. The carb icing has now been sort, I sorted that but getting a 2” diameter hose and rammed it up underneath the cylinders to catch all that lovely hot air and routed the other up underneath the carb manifold and it’s worked a treat. Anyway the last issue I have to over come is if I accelerate normally all is good the engine picks up speed and nicely comes onto boost but if I floor it in any gear she will stumble and popping can be heard from the exhaust.

[buguy]

I seem to get that with mine if I have a vacuum leak somewhere. Have you check that out yet?

[advinnie]

I will go recheck now for a vacuum leak