Hard Starting???

I have recently installed a brand new 1835cc motor with dual Weber 48idf. After I drive the car and the temp gets to around 200 degrees. After parked for about 5 to 10 minutes my Speedster takes around 10 trys to restart. I have to hold the gas pedal to the floor then my car will start. When the motor is cold I have no problems. Could the engine bay be getting to hot? I know my Carbs are not getting flooded. Maybe the gas is heating up in the carbs? Does anymore have any good suggestions on fixing this problem or did anyone else have this problem?

Thank you in advance, Kawika55

Try a simple fix first. Sounds like fuel may be vaporizing in the fuel lines. Check the routing of your fuel lines. First try is to move or shield fuel lines from hot metal surfaces. It it makes a difference, then you can do a permanent fix which may mean increasing the length of the fuel lines for a permanent move and/or going to braided line. I'm sure others with more knowledge will chime in.

First question, why would you put dual 48s on an 1835? Dual 40s would be perfect, and much easier to tune properly.

Thanx Danny, I thought it was me. 48's sound a bit big.

~WB

Jim,

Thank you for the advice I will try your suggestion.

I already had the dual Weber 48idf from another motor and my other friend was able to jet the carbs to my motor. I did not run the Kadrons, I had from the 1776 motor. Because I sold the 1776 Motor complete, that came with the Vintage Speedster I have.

aloha, Kawika55

Hmmm.... maybe I should re-jet the carb on my notchback so it isn't so hard to run at idle...


...or maybe its the alien dozing on the rear deck causing problems?

Is that Mulder's old car?

Carb heat soak? Clogged float needle valve? Bad float? You might hear the fuel percolating in the bowls after shutdown. A phenolic spacer between the head and intake would help with the heat. Could even try double or triple gaskets. But your carbs may then not get enough heat in winter. Is the carb really hot to the touch? Pull the aircleaner off and look down the carb to see if there is any fuel dribbling down the intake. Also check how much fuel is in the bowl. If the level's down, that fuel's sitting in the intake flooding the engine on restart. Your WOT start clears the flooding.

Bad coil? Can cause starting problems when hot, but I would think you would also notice the engine running rough when hot as well.

Or could just be the way things work. VW does recommend a WOT start when warm. So they knew it was an issue.

What Danny said. While you'e at it switch to Dellortos--I did and wonder why everyone doesn't make the change. Night and day difference.

Hey Justin, he's in Hawaii, they have no winter... :-)

Mechanical or Electric fuel pump? I've had issues with my mech pump in the heat before, since the fuel line has to drop down low to get to the pump intake. Ended up re-routing the fuel line from the firewall higher up and further away from the heads, which helped a bit.

I agree with the other guys that 48 IDFs are waaay huge for that size motor. Webers do allow you to resize the venturies & just about everything else, so maybe it's possible to tune it down enough to work. Since it runs ok cold, maybe we're barking up the wrong tree.

Posting a couple pics of the engine would help