200 Intake

[tjnavyblue]

Hello there!

A friend and I are building a turbo 200 (see thread under the Turbos section) and we're considering fabbing up an intake manifold. We happen to have access to a few trinkets like a CNC plasma cutter and all the regular machine shop stuff, and with some knowledge of how to use them.

Our plan is essentially to mill most of the intake log off, leaving the webbing between the ports next to the head. We would then autocad and plasma cut a flange which we would bolt to the ports via holes in the webbing.

The manifold itself would consist of variable length runners (pipes basically) coming from a collection body of some sort.

Anyway. will post pictures (tomorrow we start milling).

Anyone done this before? We're both students here at OIT so access to the engineering machine shop is not an issue, as it might be for most others.

Just thought you might like to follow along.

 

[gb500]

have alook at this site :

http://www.geocities.com/hotrod_inline6/

specifically : stroppe & assocu\ites modified head

shows you how its been done before- i think they used to furnace braze the flange on

brett
melb

 

[tjnavyblue]

That's interesting. We are going to try to retain the exhaust manifold, but other than that it looks pretty much the same. I couldn't tell from the pictures how they connected the carb to those intake runners.

 

[gb500]

yeah not sure about the carb mounts - i assume that once the runners was on then some sort of carb flange would be fitted - or maybe it was going to be some sort of 60's hi tech fuel injection and have open inlet runners+ slides


anyway gives you the idea of what to do.

be ineterested to see the pics of teh machined head and plate


i have in my parts stash an 60's/70's alloy intake manifold to fit triple 1.75" SU carbs to the log head - only problem is you need to mill off the log and braze a plate on to fit the manifold to. just havent got round to it - on the to do list


similar set up to thisnot mine though)

http://xr8ute.com/car_xw_ute.php


brett

melb

 

[80broncoman]

Isn't intake runner lenght going to be moot piont with a turbo?

 

[tjnavyblue]

That's true, runner length will not matter as much with a turbo, but why go to all the work of fabricating an intake without taking that into account?

Maybe I'll ditch the turbo someday, it'd still be nice to have a well performing intake.

The machining went well. The exhaust ports are higher than we were hoping, but it'll still work. We'll just have less flange than we had hoped along the bottom of the intake ports. Cast iron is weird stuff. Hard but not real resilient.

Thanks for the input! That three carb setup is sweet. I bet tuning was fun on that one.

 

[addo]

I probably should have raised this issue yesterday...

One of the "benefits" in the 2V and similar head designs, is that they allow placement of injectors for a pretty good shot down the intake. Once you place the actual runners in that angle - it would be fine for draw-through turbo or propane power, but multi-point injection will likely be compromised.

Regards, Adam.