How much TB is too much?

How much TB is too much?

Postby jrandy » Fri May 28, 2010 11:06 pm

There are alot of throttle bodies out there to choose from, but I don't know which one to choose.

What is a reasonable size TB for a 2275cc aircooled engine in a woods buggy where torque and off-idle performance are important?
Is a 60mm Mustang 5.0 TB in the ballpark?
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Re: How much TB is too much?

Postby vdubjim » Mon May 31, 2010 12:48 am

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Re: How much TB is too much?

Postby jrandy » Mon May 31, 2010 5:58 pm

I checked some of it out & there is more to learn.
It looks like runner length/volume and plenum volume are the big things.

So, my next question would be- if getting the ideal runner length to match cylinder volume cannot be reasonably achieved on a particular engine layout, can you kind of make it up with plenum volume?
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Re: How much TB is too much?

Postby vdubjim » Tue Jun 01, 2010 5:21 pm

In one of those posts they discuss it. Something about room for the plenum and TB.
I wouldnt be surprised if some torque is gained or lost in doing that, but im sure it wont be too adverse.
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Re: How much TB is too much?

Postby jrandy » Tue Jun 01, 2010 11:09 pm

Retro-fitting a FI plenum into a 40-50 year old engine bay is challenging.
I have come up with a couple of cardboard mockups, but there is much to learn.
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Re: How much TB is too much?

Postby vdubjim » Thu Jun 03, 2010 9:47 pm

then why not use stock stuff? German FI stuff, or mexi FI stuff?
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Re: How much TB is too much?

Postby jrandy » Fri Jun 04, 2010 11:10 am

Yeah, we could adapt stock parts, but when you get into stroked/bored engines the stock stuff kind of comes up short.
If I had some stock FI parts I would probably be working with them, but I have none and haven't run across any lately.

I picked up some Ford 5.0 parts last night for mock-up purposes & will be hacking that stuff this weekend.
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Re: How much TB is too much?

Postby vdubjim » Fri Jun 04, 2010 3:37 pm

i hear that, i was going to use watercooled vanagon ends with the pipes cutoff and make new ones to fit the type 1. the ends are HUGE.
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Re: How much TB is too much?

Postby jrandy » Sat Jun 05, 2010 10:54 am

I am messing around with some parts from a 95 Mustang GT.
My friends have a large band saw & I am going to section up some of this stuff to see what it looks like inside, and to see if perhaps the parts can be used in different ways.
I will probably end up with a pile of scrap, but you never know...
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Re: How much TB is too much?

Postby vdubjim » Sat Jun 05, 2010 12:19 pm

wish i had a bandsaw :) it would def help.
If you look at my ideas thread it might help you with the endcasting/injector parts at least.
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