Stroker engine and stock heater boxes, anyone running them??

[AlteWagen]

Using stock or stockish heads and valve sizes.

Any problems?

Excessive cylinder head temps?

What shrouds did you use?

[Teeroy]

Stock size valves and smaller carbs will work. John at Aircooled Net suggested no larger the a 78mm crank when I was planning my bus stroker with stock heater boxes.
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[AlteWagen]

Why 78MM? problems with fitment or too restrictive for the displacement?

[VWDruid]

I get High CHT on steep grades going 65+ mph.

from sf to sac I averaged 350 high 411, with a single qp

http://www.thesamba.com/vw/forum/viewtopic.php?t=2...;start=360
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[krusher]

[AlteWagen]

2275cc
82mm Scat Forged 4340
94mm Mahle B
5.5 Eagle H beam rods
Engle 100 cam
12lb flywheel
VW 041 heads 39x32
36mm Dellortos
1 3/8 header
8:1 compression

I was going to install 37.5 exhaust but since they were NOS heads I will wait till they need a rebuild.

Ive heard this will be a tractor engine and wont be fun to drive.

[ALB]

Stuntmanus built a similar motor (2110, 35x32 some porting, C25 I think, Oettinger 40 mm carbs) http://www.thesamba.com/vw/forum/viewtopic.php?t=393153&postdays=0&postorder=asc&start=0 and put it in a beetle, where he found it to be a little short winded for his taste. What are you putting it in?

Teeroy- What size motor did you build? Specs? How does it run?
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[74 Thing]

I would consider running a 1 1/2" header and 1 1/2" heater boxes with that displacement and heads pushing your bus around. While the 1 1/2" heater boxes do not have the fins, your heads will thank you for using them.

I would also look at the cam again..have the heads been ported and set up with heavier springs and shimmed accordingly?

[AlteWagen]

going in a bus.

I will not use the crap 1 1/2 boxes. Are you saying the heads will have problems with stock boxes?

Heads are stock large port 041s, cleaned up with sanding roll. Bugpack single high rev since i will be using the E100.

[Almost Alive]

I was actually just discussing this with Jacob from Brother's VW. They only recommend using stock heater boxes on stockish engines. The largest they recommend them on is a mild 1776.
"We only believe stock heaterboxes should be used on mostly stock engines. We only recommend them on mild 1776cc engines. People can get away with stock heater boxes on bigger engines on the surface streets, but even a 1776 can gets hot on long freeway drives. All that heat can crack the heads. We almost always build engine with performance heaterboxes. We have 1776cc engines in England with performance 1-1/2" heaterboxes."

[74 Thing]

In my experience those heads and those pistons and engine displacement with small diameter stock heater boxes = excessive heat and cracked heads.

Get a 1 1/2" system-either the heater boxes or merged 1 1/2" system.

Remember the stock heater boxes are SMALLER then 1 3/8"-measure them.

[vwracerdave]

That engine will run hot and overheat with a 1 3/8" exhaust and stock heater boxes. Weather you like it or not you need 1 1/2" exhaust.
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[Almost Alive]

I'm thinking of assembling an all stock engine with exception of 90.5mm pistons. Cam, carb, crank&rods all stock. I'm either going to use a set of ported SP heads or stock DP's. Does anyone think I will have a problem running stock heater boxes with this set up? It will be driven on the highway often though I'll be taking the boxes off in the summer.

[Teeroy]

More of restriction verse displacement.
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ARR #3
www.autosportsnorthwest.org

[Teeroy]

Those early 041's with the odd valve size can run hot.
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Founder Derr Wheat Panzers (DWP)
ARR #3
www.autosportsnorthwest.org

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[Brian_e]

I just finished a 2054, 74x94 with heater boxes and it runs amazing. I have about 5000 miles on it. I built it to make a ton of torque for my daily driver bug. It will climb any hill around here with pedal to spare, and is surprisingly quick in town. I am still working on the tuning, but I average 23mpg driving it like a 16 year old. Here are the specs.

74mm 4140 crank.
94mm mahles
CB unitech rods
stock DP heads, 35x32, stainless valves, really good 3 angle, P&P by me. Single HR springs, solid shafts.
57cc chambers
110 cam
.053 deck height
8.7 CR
12 lbs flywheel
1 3/8" hideout w/ stock heater boxes
40mm kadron's w/chokes, 30mm vents

It went together real easy, with no extra clearancing, and it is easy to tune. It might not rev as high as some, or have as much HP, but it does pull my full weight bug around really good with the heat on full blast when it is 15 deg. out.

Brian

[craigman]

Brian,
thats a nice little combo you got their!
Don't ya just love torque! All you got to do is ease on the gas pedal!
Torque rules the street!

[modok]

Nobody has mentioned rpm, and it's all about rpm.
Stock heads and heater boxes will become a restriction past a certain rpm.
The bigger the engine the sooner this will happen in the rpm range.
I too reference the case of our friend Stuntmanus, his big engine with stock heads is a good example of where the limit is. You can compare whatever engine size you plan to his 2110 to see where your limit might be.
There are ways to cheat a bit if you put effort into it.
More exhaust duration, or using a header tuned to work well as the heads become the limit will both help you to get more out of the stock parts.

S0 if you put some effort into it you can make your 2276 work ok up to 4k rpm and maybe a bit beyond.
But it sounds like you don't want to use special parts and custom ground cams, in which case you should take the easier road and get the correct heads.

[Jimmy111]

Not only that but stock heater boxes are highly restrictive and turbulant. They are designed to restrict flow and cause heat. You will have trouble at higher RPM;s and larger displacements.
See photo: