Plastic Throttle Body

[trikermutha]

Is it true the new M8's have plastic throttle bodies? :shock:

I seen someone advertising a billet throttle body to replace the plastic ones.

 

[Jack Klarich]

Yup, the housing is plastic

lighter and cheaper to make

less problems with inner casting flaws = smoother air flow

 

[jc1300]

Yup, the housing is plasticlighter and cheaper to makeless problems with inner casting flaws = smoother air flow

Can we change Jack's handle to Obi-Wan Kenobi? He's got the answers! Glad you are on the site Jack...jc

 

[DK Custom Products]

Is it true the new M8's have plastic throttle bodies? :shock:

I seen someone advertising a billet throttle body to replace the plastic ones.

Yes, the TB is plastic. When we discovered that we thought it may even be beneficial.

Since the cooler the air is when going into the combustion chambers, the more efficient the engine will perform. We were thinking that the plastic would retain less heat than the metal TB's.

But all the testing we did, we did not see more than a 5* difference between the metal and the plastic.

So, like Jack said, it is probably just done to save costs.

As of now we have not heard of any failures...but it has only been a bit over a year.

Kevin

 

[trikermutha]

I guess time will tell

Hate like hell to find out over time a piece breaks off and into the combustion areas. :gaa:

The article/ad was saying with higher temperatures it could cause the plastic to deform etc. Not sure how true any of that was

 

[rhino 2]

I guess time will tell

Hate like hell to find out over time a piece breaks off and into the combustion areas. :gaa:

The article/ad was saying with higher temperatures it could cause the plastic to deform etc. Not sure how true any of that was

I wouldn't think it would get hot, What would, the air velocity cooling it down. I know with some carb's the throttle plate will ice up at times even in the summer...My Rhino has a heater in the throttle plate and its on all the time as far as i know.. Its all automatic, Turn the ignition on and it goes on...:Shrug:

 

[peteg59]

Not too surprised at this obvious cost saving measure by HD. It sux that they've stooped to using plastic on their engine components, but they've got to stay competitive in today's marketplace.

Time will tell on it's long term durability in the real world....:Shrug:

 

[trikermutha]

I wouldn't think it would get hot, What would, the air velocity cooling it down. I know with some carb's the throttle plate will ice up at times even in the summer...My Rhino has a heater in the throttle plate and its on all the time as far as i know.. Its all automatic, Turn the ignition on and it goes on...:Shrug:

In between two cylinders I bet its well over 250 deg or higher.

A heater in the throttle plate never heard of that? Please explain :Shrug:

 

[DK Custom Products]

I guess time will tell

Hate like hell to find out over time a piece breaks off and into the combustion areas. :gaa:

The article/ad was saying with higher temperatures it could cause the plastic to deform etc. Not sure how true any of that was

I would be more concerned about cracks, and subsequent leaking. Time will tell.

There are some crazy durable plastic nowadays.

We use some plastic sleeves when powdercoating. They are subjected to 600* over and over again and are just as good after hundreds of cycles as they were when they were new.

Kevin

 

[rhino 2]

In between two cylinders I bet its well over 250 deg or higher.

A heater in the throttle plate never heard of that? Please explain :Shrug:

Can't explain it, Its factory and in-line fused also labeled right on the wire ''heater.''...

I first noticed it when i had the engine cover off a few years ago to check /adjust the gear indicator lights.

I assume the wire is hot when the ignition turned on,Other than that I haven't any other info on it..:Shrug:

 

[Jack Klarich]

Surpising, The plastic throttle bodies do hold up to heat fairly well

We have seen this in the automotive end for some years now The only down turn is the throtle plate bushing bosses are not stout enough

Over time they will crack and cause eratic throttle response

They are here to stay so we best get up on them, and try to figure what makes them tik

 

[Jack Klarich]

Can we change Jack's handle to Obi-Wan Kenobi? He's got the answers! Glad you are on the site Jack...jc

Thanks, just here to help when I can

 

[rwhgme]

I own an 80+ year old Bakelite, Tube powered radio. It gets HOT! The plastic still looks incredibly good!

 

[trikermutha]

stuff made 80 years ago was normally made to last for many years compared to the junk they sell now.:laugh:

 

[Jack Klarich]

I own an 80+ year old Bakelite, Tube powered radio. It gets HOT! The plastic still looks incredibly good!

stuff made 80 years ago was normally made to last for many years compared to the junk they sell now.:laugh:

True

Bakelite material was more on the ceramic end if I remember right

It handled heat pretty good in the day

Over time it did show signs of cracking

Hence modern day ABS plastics and more JMO