@rocky posted:What a mystery!
I have not seen anything about the PIM “Hammer” motors since PI stopped publishing their glossy magazine…. I’m guessing that was in 2005?
How long had the car been in the shop?
Seems that it’s pretty much the same as specified in the PIM description. Is there anyone else running these engines that might provide their own experience?
Too bad there’s no dyno data…
Good Luck!
Rocky
In their description, PIM states that the "engine" is dyno tested. At this point I presume that they mean in general, since the specs are all the same, and not specifically each engine that they build? I have not seen a print out anywhere of the dyno results though?
Strange that this information from them would not be readily forth coming?
Ditto on the cam timing?
I'm thinking that there are only two items left to eliminate? A smoke test is a necessity and then when all else is eliminated, cam timing?
As far as a PCV system goes, until I worked on my Webers in an attempt to make them more street friendly, I never considered that a PCV system was a controlled vacuum leak before hand?
When plumbing the "Weber 'eight-stack' " together, that becomes readily apparent. In the case of the Webers, it amounts to about a 2 inch loss in vacuum in the system.
After much tinkering with the system, that was all I could reduce the loss to.
So in retrospect I could get a PCV system to work with the carbs but to get power brakes in the Pantera with Weber carbs, a vacuum pump was necessary.
As an interesting aside, originally when I "interviewed" Gary Hall about the PB issue, he said all I needed to do was get vacuum from one cylinder and that was how his intake manifold was made, i.e., with one cylinder drilled for a vacuum port? I'm not sure how he came to that conclusion but I do know that he would change the carb auxiliary venturi (chokes) to 32mm. Stock they were 37's.
Maybe with that change the vacuum characteristics change? I never tried that though?
I think right now though in your case switching to an EFI is essentially just enabling you to tune everything with the computer? I don't think that is a solution, just an aid in centralizing your thinking and simplifying changes and saving time in making them.
If this is a vacuum leak, it's big, just like the disconnected pcv is, like one of the port runners is cracked underneath somewhere. While on that subject, why not completely block the pcv system and retest?
I found that there are no good "off the shelf" pcv valves and the only thing to use was the adjustable pcv system, by ME Wagner.