Author Topic: Engine power drop (Read 1250 times)

4yuckfous · « **on:** September 04, 2012 - 02:24:19 AM »

Hi together

I'm on the search for a connection to a drop in performance of the engine.
At high ambient temperature (around 80�F) and mounted Shaker it happens a few times,
that the engine goes out on idling, (low RPM) .
Even when accelerating (2nd throttle level) is there any performance.
When accelerating, it feels like the engine speed limiter at excessive speeds.

Now I have installed new spark plug wires, the shaker is removed and the fuel line isolated,
from the middle of the car until the engine compartment.

On the 1.5 hour long test drive (it was nice warm), but without Shaker,
however, no loss of power be established.
The heat could escape even through the hood.

Can it be from "boiling gasoline" (gas bubble formation)?
If so, where can / could do these happen?
Are problems with QFT carburetors known?
Is a mass problem (ignition) (more temperature, more resistance) possible?

Thanks for your feedbacks

Chryco Psycho · « **Reply #1 on:** September 04, 2012 - 09:51:54 AM »

I would suspect the heat is trapped under the shaker & boiling the fuel , blocking the heat crossover under the intake is a must do

4yuckfous · « **Reply #2 on:** September 05, 2012 - 02:41:34 AM »

someone has experience with a heating shield between the carburator and a SB engine?

Chryco Psycho · « **Reply #3 on:** September 05, 2012 - 05:35:47 AM »

Holley has a thin alum plate that will help , better is a thermal insulator but it has to be at least 1/2 " & may not work with the shaker
http://www.dodgecharger.com/forum/index.php/topic,52284.0.html
this article has some interesting info

4yuckfous · « **Reply #4 on:** September 05, 2012 - 12:32:01 PM »

I had today a phone call with QFT.
Nice and friendly people there

He gives me the hint to call Coolcarb.

Coolcarb make differnet heating shields in different thicknesses and different styles.

brads70 · « **Reply #5 on:** September 05, 2012 - 06:50:51 PM »

Also try using fuel with no ethenol! It boils quicker with ethenol! I have a T/A style air cleaner and also have issues boiling fuel but only when sitting in traffic.
I'm going to try a blower from a boat application also used commonly on circle track cars for cooling brakes and carbs.
Here is a post on it.
http://www.cuda-challenger.com/cc/index.php?topic=81127.msg813028#msg813028

4yuckfous · « **Reply #6 on:** September 07, 2012 - 01:40:31 AM »

I found some worst pics about that plate with melted core.
I made a few phone calls to "plastic" plate suppliers.
They told me PVDF or PEEK will be the right material to do that plate.

I will let you know.

dodge freak 2 · « **Reply #7 on:** September 08, 2012 - 10:34:55 PM »

Again if the exhaust heat ports are open they should be block off with steel shims, that would cut the heat way down to start with

4yuckfous · « **Reply #8 on:** September 24, 2012 - 03:05:45 AM »

Done...
We will see....

Author Topic: Engine power drop (Read 1250 times)

4yuckfous

Engine power drop

Chryco Psycho

Re: Engine power drop

4yuckfous

Re: Engine power drop

Chryco Psycho

Re: Engine power drop

4yuckfous

Re: Engine power drop

brads70

Re: Engine power drop

4yuckfous

Re: Engine power drop

dodge freak 2

Re: Engine power drop

4yuckfous

Re: Engine power drop