CI/VI head setup questions

pmuller9

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fast64ranchero:1rqpbl9u said:
Turbo choice is a EFR black series 8474. Unsure on what EFI will be used, I may start with Holley sniper to get it running.
At first I thought the 8474 would have a compressor that was too large for a 200 six operating at 7500 to 8000 rpm but I see that it is a hybrid based on the smaller 8374.
You may lose a little spool time response but the higher rpm flow is greatly improved over the 8374.
The 8474 is used by the racers pushing 900 hp and need a fast response.

Here is the 8474 map superimposed over the 8374 map.
The red line is the load line for the 200 six operating between 3500 rpm and 7500 rpm at 20lbs of boost with an engine VE of 95% trailing off to 88% with a 60% intercooler efficiency.
Notice that the engine would never be able to use the extended region of the map for the EFR 8474.
It would require the engine to operate near 10K rpm to get there.
Also consider there is less margin to the left at the surge region for the 8474 versus the 8374.

The Holley HP would be a good choice for port injection.
 
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drag-200stang

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I am thinking same a pmuller.A bit to big.
Make a great dyno racer, but not a great pavement racer.
Please when you are finished with the build please post up the part specs that you used and any info regarding them.
You are doing a fabulous (y) job.
 

pmuller9

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I just updated post #41.
I'm very interested in this project.
AFAIK it will be the first time the aluminum head will have been set up properly with the right length valves, valve springs and port work to run the 200 to it's limit.
This also includes the aftermarket rods.

x2 on a job being well done!
 

Sergeant82d

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Supporter 2019
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After a couple of months of isolation, have you been able to make any more progress on this? I'm building a very similar engine for the roadster pickup I'm building... Would love to see some encouragement! :D :beer:
 

fast64ranchero

Well-known member
Sorry guys, Haven't been on in a while and, well, Life has changed. The engine should be in my "new project" 65 FB Mustang this month, and should be interesting.
 

fast64ranchero

Well-known member
I have the EFR 8474 Black series turbo, it may be too big, but so is the cam, so the cam and turbo match up with each other. I agree they both may be too big for the combo, but both were spec'd by the experts at Comp cams and Full Race. My requirements to both companies was I wanted to be making power at 3500 rpm, even if that number goes up to 4K rpm, it still leaves me with 3-3500 usable rpm, kind of a crap shoot when you are dealing with the unknown.... We shall see... My guess is 500rwhp and 450 ft lbs at 15-18 psi of boost
 

jaan-e

Active member
Was there ever a buildthred on this monster?
I`m in the " uppgrade / rebuild " mode my self, so any specs would be nice.
I´m leaning to the Toyota rods too, and the longer valves/springs and retainers. Triple Weber Na 200 for my part.
Keep up the good work(y)
 
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