Inliners International Forums General Discussion Blown and Injected Update

It's a 69 Camaro.
Not much progress. I mini tubbed it. Setting up a 4 link rear set-up w/a new rear end.
Still need to put together the front suspension.
I am on furlow because of the goverment shutdown, so cant spend $$ , story of my life.
Keep up the great work!

MBHD

Why did I think you were working on a Firebird?? I knew it was a Camaro.
Brain fart

Hope you get back to work soon!

P

So, I wish I had re-read this thread about a dozen times.
My engine is now ready... we were dissuaded from using port dividers in favour of lumps. So, we did.
So, my question is this... are the lumps the source of the lean condition on the outside cylinders? Or, is it the lack of dividers (head design)?
I’m worried because I’ve gone well past budget to get my engine together.
I will be blow through carb for the time being... is that going to be the difference?

No its a port configuration/valve timing problem.

This is for a austin mini 4 banger - but the problem is explained.
port_cam

Interesting.
I’m still a little confused by this because L6 does not have a firing order that shares ports. 1-5-3-6-2-4. So, there is no intake overlap.
I guess I am stuck on the thinking that if the charge is sitting on the valve, it can’t be stolen by the Siamese cylinder.
So, the ultimate solution to keeping cylinders 1 & 6 from going lean, is port dividers (or 12 port head). That will control the charge going to each cylinder?
😒 wishing I’d continued with the dividers.

Well after all the turmoil I wish I had gone straight for a 12 port head. Probably would have been a lot less expensive in the long run. A hybrid head would have been interesting.

I did get a few miles on the car this year, but didn't beat on it too much. It runs quite rough at idle. More like a miss than a cam roughness, and it tends to load up. A good tuner will probably make some improvements.

I managed to get 25 miles per gallon on the highway just cruising at about 60-65 miles per hour. The car is not intended to be used for drag racing, but hopefully I will get a chance to make a few passes next year just for fun.

One thing I have discovered is the the gear ratios in the TKO 500 transmission are not ideal. The super low 1st gear is a pain in the butt, was better when it was just a 4bbl and header car. I'm looking at going with a TKO 600 close ratio. Will have to crunch that a bit once I decide on rim and tire combination.

I am happy with the result, and am looking forward to tweaking it a bit after some other changes are made to the car.

With luck and a some good planning I would like to drive it to Miden in 2020.

L6 does not have a firing order that shares ports

Both the 1-2 and 5-6 have alternate 240°-480° firing. Any cam with more than 240° will have leakage.
Only the 3-4 pair are completely separated.