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> My 2.4 Six Engine, Manufacturing prototype intake adapters.
JmuRiz
post Jul 19 2013, 09:15 PM
Post #21


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Carbs for up to 3.0 are typically 40, but this size will work well with EFI, as the computer can better control the fuel delivery. Seems like a good size, from the little bit I've heard.
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McMark
post Jul 26 2013, 08:08 PM
Post #22


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Okay, time for another thought/question. The engine is a bit unknown on the inside. Here's the story that came with it.

QUOTE
70T p &c's
E cams

1969 Factory "S" heads
a. Port size 36X35 38mm intake
b. Valve size 45X39

1972 engine case

Engine right side below shroud: *6123464


Question is, should I pull the heads off and check what all I've got? Maybe a valve cleanup job?
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Mike Bellis
post Jul 26 2013, 09:40 PM
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Open it! You know you want to. DO IT!!!
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Mark Henry
post Jul 26 2013, 09:51 PM
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QUOTE(McMark @ Jul 26 2013, 10:08 PM) *

Okay, time for another thought/question. The engine is a bit unknown on the inside. Here's the story that came with it.

QUOTE
70T p &c's
E cams

1969 Factory "S" heads
a. Port size 36X35 38mm intake
b. Valve size 45X39

1972 engine case

Engine right side below shroud: *6123464


Question is, should I pull the heads off and check what all I've got? Maybe a valve cleanup job?

Slippery slope. (IMG:style_emoticons/default/unsure.gif)
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rick 918-S
post Jul 26 2013, 10:02 PM
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Do a leak down first and make sure you "need to"
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McMark
post Jul 27 2013, 02:58 AM
Post #26


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It's more about knowing what heads, cams, pistons and compression ratios.

I have been dying to build another six engine. This isn't exactly a build and I don't have the funds to actually change anything so it can't get too crazy, other than possibly adding spacers to lower compression so I can run dual turbos. (yeah, I have the disease)
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Gary
post Jul 27 2013, 04:00 AM
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Hey Mark - is this the motor I dropped off? If so, I have details on the build.
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Eric_Shea
post Jul 27 2013, 10:14 AM
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What does this mean?

a. Port size 36X35 38mm intake

36 intake
35 exhaust
38?

Only two ports per head.
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sixnotfour
post Jul 27 2013, 10:33 AM
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that configuration only has about 8-1 compression.

sell the 69 S heads and buy find some 2.2-2.4 heads.
T and E heads have the same port size. You will get easy to find valves, 40/46 and get back the .5 compression
they are easy to port to 36mm intake, Well depending on how you do it..

Or just run it, since you want to TURBO
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Dr Evil
post Jul 27 2013, 11:22 AM
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(IMG:style_emoticons/default/popcorn[1].gif)
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Trekkor
post Jul 27 2013, 10:16 PM
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Bolt on a set of carbs and run it on the test stand.


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McMark
post Aug 5 2013, 11:30 PM
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The $2500 carbs I don't have? (IMG:style_emoticons/default/blink.gif) Life is so simple when you're spending someone else's money. (IMG:style_emoticons/default/laugh.gif) Plus, what do I learn from bolting on carbs. I'm not building a car. I'm building an education.

I've been wanting to start familiarizing myself with AutoCAD and this seemed like a good project for this since the intake adapters I'll need are relatively simple.

I started with an intake gasket and scanned it. Then cheated and drew the outline in Illustrator since I can bang that out in about 2 minutes. Then imported that into AutoCAD and did the extrusion. It's pretty boring at this point. Gotta measure my actual intake port size, the OD of the throttle bodies, and decide on the height of the adapters I need/want. Then I'll start working on the actual tapered tube portion.


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McMark
post Aug 9 2013, 01:15 AM
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Finished the intake drawing (I think). Now I need to find someone who can print a prototype for me.


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jimkelly
post Aug 9 2013, 06:48 AM
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will those Polaris fuel injectors provide enough fuel?
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McMark
post Aug 9 2013, 10:39 AM
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The injectors are pretty standard. So I was already planning on swapping them, I just haven't done any research into finding what I want to use. Something high impedance is certain, but I also need to find out what flow rate I need.
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polo classic
post Aug 9 2013, 12:33 PM
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Do you know what distance is from the throttle body to the valve on the OEM Porsche high butterflies throttle bodies?

From looking at the Rothsport versions, it looks like the manifolds are around twice the height of the throttle bodies

(IMG:http://www.914world.com/bbs2/uploads_offsite/rothsport-racing.com-13650-1376073558.1.jpg)
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McMark
post Aug 9 2013, 01:59 PM
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Not sure. I drew up 'shorties' because once I looked at the room in the 914 engine bay, there's only about 11" overall of space from the cylinder head mounting to the top of the engine bay. The TBs are about 4.5" and short, individual K&N filters are about 2", which leaves 4.5" of room for the adapters. And that's if I use all the available space. So I decided to just design the shorts ones and get a prototype made so I can hold it in my hand and see how it looks.
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Trekkor
post Aug 9 2013, 03:25 PM
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QUOTE(McMark @ Aug 5 2013, 10:30 PM) *

The $2500 carbs I don't have? (IMG:style_emoticons/default/blink.gif) Life is so simple when you're spending someone else's money. (IMG:style_emoticons/default/laugh.gif) Plus, what do I learn from bolting on carbs.



I was under the impression that this was an unknown condition motor that you were trying to determine whether or not it needed rebuilding.

I have a set of carbs/manifolds you could borrow for testing off my 2.6 race motor.
I still have that 6 into 1 tee pee off road exhaust for full effect...


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McMark
post Aug 9 2013, 04:29 PM
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Ahhh, thats makes more sense. (IMG:style_emoticons/default/wink.gif) I expect it runs. I'm just planning on pulling it apart to know for sure what's inside and what the compression is, etc
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McMark
post Aug 9 2013, 07:28 PM
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Prototype printing underway (not by me). (IMG:style_emoticons/default/boldblue.gif)


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