Topic: was: Re: 62mm Performance Throttle Body

[FourbangerYJ]

Well a metal guide would be best since it wouldn't get ground down and stop you from grinding too much.  Using a 2" drum would keep the hole pretty round and even since it makes a nice arch that will be close to straight.

Why is it bad to make the hole to big or out of round?

How thick is the manifold where the grinding is needed? My guess is about 1/4 inch or less.

[Jeffy]

Why is it bad to make the hole to big or out of round?

How thick is the manifold where the grinding is needed? My guess is about 1/4 inch or less.

An uneven hole disrupts the flow of air and causes turbulence which is bad.

[jonzjeepyj]

I finally had a few minutes to myself over the holiday weekend to get the 4.0L TB upgrade done. 
I did shave the inside with a pneumatic grinder and replaced the gasket.  I followed the directions
in Jeffy's thread and had no problems.  No sporadic idols when I started it up the first time and it
purred like a kitten.  W o W !  The throttle response was Much Quicker and Much Smoother as
promised at the low end and the power band now stretches up to 4500 Rpm's.  I really like this
upgrade and after talking to all of you, I'm now wanting the 62mm TB instead of the 58mm/4.0L TB.
I'll be getting a larger tube kit and a high flow air intake for better aspiration.  As of now I'm using
the 2.5L rubber air tube on the 4.0L TB with both air restrictors removed in the stock air box.  Next 
I'll be looking for the Ford 19lb or 24lb injectors as per your recommendations.  I'm leaning towards the
19lb injectors after reading some of your posts but will keep researching.  I would love everyone's
input BEFORE I buy anything this time.  LOL
   

[Bounty Hunter]

If you think throttle response is quicker now, you should try one of my 62mm TB's that remove the taper beneath the throttle plate.  That stock taper requires a lot of throttle plate movement before any air gets past it.

[jonzjeepyj]

Bounty Hunter,

   After the positive performance of the 4.0L TB,  I will be wanting to upgrade again to a 62mm TB in the near future.  The way you worded your response it sounds like you might have a few.  Any 62mm TB's for sale?  How much should I pay for a new/used 62mm TB.  I also want to add the TB spacer.  I came across a article from gear poet and it stated that the spacer doesn't do much but it does disturb the air flow due to its helix spiral  /which cooled the air temp / which gave it a boost.  Just going by what the article said.  Here is a link to the article and the results for those of you that haven't read it. 

   http://4bangerjp.com/forums/index.php?topic=424.0 

I want to do the Elect fan conversion first before I upgrade to the 62mm TB. 
Thanks for the response,
John