What to do with 1.7 Type 4 in 356 Speedster?

This is the place to discuss, or get help with any of your Type 4 questions.

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Mave
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Re: What to do with 1.7 Type 4 in 356 Speedster?

Post by Mave » Sun Jan 28, 2018 2:01 pm

Speaking of distributors; would a standard 009 work satisfactory? (Weber 40 IDF, 1911cc, Webcam 86A).

wreck
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Re: What to do with 1.7 Type 4 in 356 Speedster?

Post by wreck » Sun Jan 28, 2018 5:01 pm

If the IDF's have a fitting at the base near the butterflys for vacuum advance I'd run the standard type 4 distributor . A 009 will work ,it's just not ideal .
No matter where you go , there you are !

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oprn
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Re: What to do with 1.7 Type 4 in 356 Speedster?

Post by oprn » Tue Jan 30, 2018 8:59 pm

Your engine build is nearly identical to mine, I started mine a little over a year ago with the goal to have it running last summer but like you life had other plans. I am back on it again now pushing to get it running this spring.

I started with a '74 1700 Bus engine that already had 96mm cylinders but a cracked head and worn out cam. I went with the Web 86 and a set of rebuilt Bus 1700 heads that have the chambers opened up some. The C/R will be lower than yours, I will be in the 8.4 range. A set of 40 Webers will be on it and I will be re-using the stock distributor to take advantage of the benefits of vacuum advance. The exhaust is a bit of a mystery yet though!

I too am shooting for a good street runner in the 100 hp range. I am very interested to hear how yours turns out.

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sideshow
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Re: What to do with 1.7 Type 4 in 356 Speedster?

Post by sideshow » Fri Feb 02, 2018 8:09 am

Not all IDF's have that port, FWIW having actually done that it works fine enough I never felt the need to make a MAP setup for that.
Yeah some may call it overkill, but you can't have too much overkill.

Mave
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Re: What to do with 1.7 Type 4 in 356 Speedster?

Post by Mave » Sat Feb 03, 2018 3:25 pm

I've just bought an original 914 distributor, and I'll be adding a Petronix unit to it. My carbs have a vacuum take-off. Is it sufficient to use it just from one carb, or do I hook up both with a T-joint?

The plan is to fire it up this spring still need to sort out some parts.

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oprn
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Re: What to do with 1.7 Type 4 in 356 Speedster?

Post by oprn » Sat Feb 03, 2018 11:48 pm

My understanding is that with them teed together the signal will not necessarily be higher in value but smoother with less pulsation. I will be trying mine both ways to see.

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