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hpw
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Location: memphis
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 Posted: Sat Jan 13, 2007 5:58 am Post subject: Engine questions |
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Engine: 2017 using Scat forged crank (78.4) and Cima 90.5 pistons. Cam is a Scat C10. Heads are 041 with 1:1.25 ratio rockers. Carbs are dual Weber 42 DCNFs (aka Gene Berg 42 specials). 009 with Perlux ignightor, Bosch blue coil, stock heater boxes, dual muffler exhaust, remote oil filter, high capacity sump (Berg), Berg transmission brace.
This is all the info I have/know about this engine from PO. Help! This car runs awesome, but with problems that I need help in going in the right direction fixing. Oil gauge at 60 to 70 mph is showing 70psi and even higher. Consequently this thing leaks oil like a sieve? Have I already damaged the engine? Will a breather box fix this? Do I just vent the valve covers? What else could I vent if that would help?
The exhaust is stock size, with dual muffler exhaust. So from what I have read here I need to upgrade the exhaust to let this breath better.What size header, muffler do I need? I need heat and the biggest heater boxes I have seen is 1-1/2". So my options are really limited to what I can do. Is any one using gas heaters? How well do they work? Is there that big of a
difference in performance from the stock 1-3/8" to 1-1/2" exhaust
system? A 1/8" increase doesn't seem like a lot. So I was looking at
these, but would they be to big for this motor.
http://cbperformance.com/catalog.asp?ProductID=1622
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bugsterkafer
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Joined: October 04, 2004
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Location: Geneva, Switzerland
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| Posted: Sat Jan 13, 2007 6:15 am Post subject: |
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You need a 1 1/2" exhaust and same size heater boxes.
http://cbperformance.com/catalog.asp?ProductID=1262
(There are other kits available..)
A breather box would help a lot for your pressure problem. Vent both of your valve covers,and join it to at least one carb air filter, both is better. A breather-tower like CBperformance or Gene Berg sells would be worth it.
http://cbperformance.com/catalog.asp?ProductID=241
Now what oil are you running in that engine? This could also be part of the issue you have, I mean the high oil pressure..
Leo
p.s: the 1 3/4" exhaust in that link is way too big for your application! Beautiful exhaust system though  |
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vwracerdave
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| Posted: Sat Jan 13, 2007 6:31 am Post subject: |
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1 1/2" exhaust would work great. 1/8" is a lot. It would shock you to see how much more liquid a 1 1/2" tube will flow over a 1 3/8" tube
A breather box might help. Vent both valve covers and the stock oil filler vent to the breather box.
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hpw
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Location: memphis
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| Posted: Sat Jan 13, 2007 6:40 am Post subject: |
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| bugsterkafer wrote: |
You need a 1 1/2" exhaust and same size heater boxes.
http://cbperformance.com/catalog.asp?ProductID=1262
(There are other kits available..)
I was looking at a Competition merge header with 1-1/2" heater boxes,
ceramic coated with Dynomax "Fatboy" muffler for $718.00 from
KYMCO AUTOMOTIVE RACING. My problem is with the ceramic coating
and how long will it last. They say that oil will eventually destroy the
finish. So that is why I was wanting to get stainless. But stainless I guess
is not availble in heater boxes that I have seen.
A breather box would help a lot for your pressure problem. Vent both of your valve covers,and join it to at least one carb air filter, both is better. A breather-tower like CBperformance or Gene Berg sells would be worth it.
http://cbperformance.com/catalog.asp?ProductID=241
I have a berg linkage with dual carburators, does anyone know if this
will clear my linkage?
Now what oil are you running in that engine? This could also be part of the issue you have, I mean the high oil pressure..
I'm using the Royal Purple 20w/50
Leo
p.s: the 1 3/4" exhaust in that link is way too big for your application! Beautiful exhaust system though |
What would happen if I where to use something like that?
Anyone using gas heat?
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hpw
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| Posted: Sat Jan 13, 2007 6:48 am Post subject: |
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[quote="bugsterkafer"]
A breather box would help a lot for your pressure problem. Vent both of your valve covers,and join it to at least one carb air filter, both is better.
Just re-read what you wrote and didn't see this
How is that done?
Anyone have pictures?
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propflux01
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| Posted: Sat Jan 13, 2007 7:15 am Post subject: |
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| Drop that oil down to a 15w-40 or less, there is no reason to run 20w-50 in Memphis area, just robs horsepower. What size oil pump? Perhaps before adding breathers and such you should find the cause of the excess pressure. with 70+ lbs, it is no wonder your valdezing all over the place. |
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hpw
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| Posted: Sat Jan 13, 2007 7:26 am Post subject: |
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| propflux01 wrote: |
| Drop that oil down to a 15w-40 or less, there is no reason to run 20w-50 in Memphis area, just robs horsepower. What size oil pump? Perhaps before adding breathers and such you should find the cause of the excess pressure. with 70+ lbs, it is no wonder your valdezing all over the place. |
Consider it done, thanks for the tip
As for the oil pump, I don't even know where its at 
but I'm learning Would I have to dismantle this to see the size?
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bugsterkafer
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| Posted: Sat Jan 13, 2007 7:43 am Post subject: |
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I don't know much about Kymco exhausts, but a ceramic coating will last for ever if well done.
It could help a bit in assesing the high pressure prob if you knew what size oil pump you have, as mentioned above: 26 or 30mm..guessing 26mm for high pressure like you have. You'd have to remove the front tin and the crank pulley to have access to the pump, should take you some time to remove it though if you don't have the "special" tool (oil pump puller).
Maybe you have some heavier case-relief-springs, could be something to consider too.
But let's swap that oil for a finer one and see the difference first.
Here is a pic of my breather box system:
(I was talking about the upper hose, going to the top of the air filter. Two hoses, one to each filter, is better than what I did.
The 2 hoses under the breather-tower go to the valve covers) |
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hpw
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| Posted: Sat Jan 13, 2007 7:56 am Post subject: |
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| bugsterkafer wrote: |
I don't know much about Kymco exhausts, but a ceramic coating will last for ever if well done.
It could help a bit in assesing the high pressure prob if you knew what size oil pump you have, as mentioned above: 26 or 30mm..guessing 26mm for high pressure like you have. You'd have to remove the front tin and the crank pulley to have access to the pump, should take you some time to remove it though if you don't have the "special" tool (oil pump puller).
Maybe you have some heavier case-relief-springs, could be something to consider too.
But let's swap that oil for a finer one and see the difference first.
Here is a pic of my breather box system:
(I was talking about the upper hose, going to the top of the air filter. Two hoses, one to each filter, is better than what I did.
The 2 hoses under the breather-tower go to the valve covers) |
Comparing the two pictures it looks like that breather box will clear my
linkage. How did you attach the hose to the air filter?
Is the neccesary hardware in the kit?
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hpw
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bugsterkafer
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propflux01
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| Posted: Sat Jan 13, 2007 8:47 am Post subject: |
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| hpw wrote: |
As for the oil pump, I don't even know where its at
but I'm learning Would I have to dismantle this to see the size? |
Crawl under it, just in front (front means front of car) of the header, underneath the rear pulley and tin, is a small square plate, which, in your case since you say it is full flowed, will have a hose coming out of it going to wherever your oil filter is mounted. Unless it is stamped somewhere on the cover, you will have to remove the 4 nuts or bolts and pull out a gear and physically measure it.
-OR-
If the P.O.'s idea of full flow was a filter/pump combo, you will not see a hose, but a big metal body with a filter on the end pointing sideways towards the left.
If your full flowed properly, your pump should either be stock 26MM, or Hi volume 30 MM
if it is a filter/pump combo, it will more likely be 32MM or 36 MM gears, which is way too big.
Check that and get back with us ( take a pic of it if you can) before we move along to stiffer relief springs and other issues. |
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hpw
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hpw
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bugsterkafer
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| Posted: Sat Jan 13, 2007 10:54 am Post subject: |
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| hpw wrote: |
bugsterkafer , Thanks for that link to the GeneBerg site,
I did not realize that they had the larger heater boxes. And If I'm reading
the web site right, it looks like I can add ceramic coating for 150.00 more. |
Yep exactly! (edit: it's actually a bit more than that, still worth it) If you go Berg, you won't go wrong 
I like to emphasize on the fact that these clear the thermostat, most other companies' exhausts don't.
Let us know
Cheers,
Leo
BTW my engine is also a 2017 |
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jamestwo
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| Posted: Sat Jan 13, 2007 11:14 am Post subject: |
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agree, area inside a circle increases with the square of the raduis. Mst people have exhaust too big. 1-1/2 is good.
| vwracerdave wrote: |
1 1/2" exhaust would work great. 1/8" is a lot. It would shock you to see how much more liquid a 1 1/2" tube will flow over a 1 3/8" tube
A breather box might help. Vent both valve covers and the stock oil filler vent to the breather box. |
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RIS
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hpw
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hpw
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vwracerdave
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| Posted: Sat Jan 13, 2007 12:27 pm Post subject: |
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You have a Berg pump cover, but what looks like a 30mm Melling oil pump.
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2010 Sportsman ET Champion - Mid-America Dragway - Arkansas City, KS
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