[T2] [VB] Hot engine

[Bob]

a random thought, because it heats on a slight incline and cools going 
down, may I suggest getting the bus weighed at a truck stop or other place 
able to find out curb weight, over the years I have found weight creeps up 
and could be overloading the engine????

Bob



On Sun, 8 Dec 2019, Chris Dreike wrote:

> To answer David's questions:
> It is a 1964 split bus
> Rear tires are 205-75-R15, Radius is: 12.5 inches from the center of the
> nut to the ground
> This is a big nut with reduction gears. 3.88 r&p freeway flier.
> RPM at 65mph is approximately 3350, as measured by the fuel injection
> computer.
> Porsche pulley on the alternator to make up for the freeway flier.
> Crank pulley is stock size from Scat with degree markings.
>
> Engine is 1776, 69mm counterbalanced crank and 90.5 jugs
> Exhaust is a vintage speed. heater boxes installed.
> Ignition is full electronic controlled by a Megasquirt ECU
> Fuel injection using mexi-bug stock throttle body and intake manifold
> Oil pump I believe to be stock size
> Full flow oil filter system
> Sorry I don't have exact oil pressure data numbers, however I did check
> that it is high when cold Maybe 60 psi and drops to 5-10 psi when warmed up
> to running temp.
>
> Cooling is a doghouse with wide fan, stock oil cooler plus a small external
> cooler from Emp plumbed in after the filter and located under the floor,
> not in the engine compartment.
> Complete tinwork is installed with all rubber seals in good condition. Most
> likely have a hoover bit installed as I assembled the tinworks.
> The thermostat and vanes are not installed.
>
> I expect that the engine was running hot even when I had a progressive carb
> on it as it was frying the oil even back then.
> And it has been hot as long as I have been running the fuel injection and I
> know this because I installed cylinder head temp sensors on 1 & 3 Sensors
> are in rings on the spark plugs.
> The heads get hot running down the freeway as soon as I'm going up a slight
> incline. they can rapidly rise to 380 and keep on going if I let it which I
> did once and hit 400.
> The temp quickly drops again when going down even a slight incline to
> around 330 or less.
> Around town the temp is running around 280-300..
>
> The spark plugs are clean as a whistle. No carbon. No melting, just white
> and grey powdery looking stuff
> The valves take minimal adjustment when I check. Sometimes too loose and
> others times just a hair tight. As I have CrMo push rods, I adjust to .002.
> Engine bullder told me to adjust at zero .
> Down shifting from 4 to 3 while going up hill does not cool things off
> unless I slow way down. As the engine is well balanced, I can run 50 in 3rd
> about 3900 rpm,
> I filled up with 91 octane on some advice, that made no change.
> At WOT the a/f ratio is about 12.5:1 per my gauge and the advance is at 28
> degrees. And the head temp just goes up.
>
> Jake Raby indicates that even under load the heads should not be much
> hotter than 340 and if the heads hit 400 that is much too hot and if they
> hit 425, get new heads.
>
> Hope I got it all here.
> Thanks in Advance.
>
> Chris
> 64 DD Kamper Kit
> 71 Sunroof
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