The Jalopy Journal
Discussion in 'The Hokey Ass Message Board' started by john mullen, Dec 28, 2017.
Oops some duplicates lol
Jimmy came in and finished the valve seats and laped the valves in.
Also cut the valve pockets for spring buckets.
I'll get it on the flow bench tomorrow if it's not to busy in the shop, lots to catch up on.. we have lots to get done on customer work. So I'll see what comes... getting really excited. I'll post some photos tomorrow..
Using the endoscope to view the port between the head and intake so I can port match them to each other
Got the ports matched up and reworking the driveshaft loop to accommodate a new 4 inch dia. Driveshaft
Next I will port match the header to the head
This is why you have to port match the header
not going to name the manufacturer but this is a poorly done header
But I did fix it. Just part of racing to make things better
Todays work report got seals installed between the bed and the shocks where they come through the bed floor, worked on a tailshaft bussing issue on the tranny, port matched the header among other small details other
I blended in the bowls to the new valve job, rolled the margins of the exhaust valves it improves the flow at low lift not to much for the intakes but some, machined the spark plug adapters and got them installed, installed the springs and valves
Why change the plug type?
Can't get a racing plug that works using the stock large plugs.
Besides DENSO is a sponsor and supplied us with 8 different heat ranges until we get it sorted out. Got it pretty close now
Great work day today..
The head is back on the engine, valves adjusted,
Looking good john
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Really Looking good.
The top end oiler is on and the engine primed with DRIVEN break-in oil through our new OBERG filter
Started working on the exhaust collector today
2 2 1/2 to one 3 inch collector.
More photos once the collector arives.
The new driveshaft arived this afternoon.photos tomorrow
Pretty cool project, great detail on everything.
New driveshaft from precision Shaft technology's.. ballanced to 6500 RPM
Regarding the question of how many cfm's the engine requires,I read at years ago that when you are at full throttle under load at the desired rpm manifold vacuum should be approximately 1". Anyone have any views on this? Greg
So you’re saying you got the shaft?
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Lol,..yes I did, almost $700
With shipping. But guaranteed smooth as a baby's butt at 6500.. I'm hoping I got what I paid for.. they make a lot of Pro Mod and Pro Stock shafts for top level racers.
Help me understand this. It looks like you're putting a small round pipe into a larger square hole???
The ports on the head match the pipes...the flange I suspect will be filled with weld and finished...
Credit to Photographer, Owner
Not finished keep following and you will see where this ends up
In an effort to take this build to the Nth degree you should consider merge style primary and secondary collectors. Pricey, yes, but more efficient.
On a carbed engine on a dyno intake manifold vacuum is typically at or slightly above 1" hg. The carb requires some vacuum to maintain a good signal.
Fuel injection on the other hand requires no venturii restriction so intake vacuum at the red line is often below one inch of mercury, typically around 0.7 "hg. That is one reason fuel injection trumps carbs in making more power - less pumping losses.
When your racing plug company thinks so much of their product they put them in jewelry boxes.
Thank You DENSO
Salt flats report.
Heavy rain last night covering the salt.
Somewhat late but now is ok still time to smooth out the salt for 2021 hopping for a really good race surface this years Speed Week.
No worries at this time. That can disappear in a day or two
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