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  1. H

    Can of worms, gt40p related (p for pain)

    Maybe you should check the length of your push rods. Sounds like the ones you have are too long. You said they were for a truck engine with a roller engine. Does that mean you have a roller cam? IIRC, stock roller push rods are 6.250" Right now, you seem to have about .20" preload (3 turns x...
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    Can of worms, gt40p related (p for pain)

    3 more turns after the push rods starts to get tight when spinning them between your fingertips (which I assume is what you meant) sounds like a lot. I never installed bolt down rockers, but on stud rockers, you usually give them 1/4 to 3/4 turn. Three turns on a 5/16-24 bolt is about 1/8"...
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    Can of worms, gt40p related (p for pain)

    This parts explains exactly what I was talking about. If you still disagree with me, maybe we can at least agree that the original poster did indeed open a can of worms :rlaugh:
  4. H

    Can of worms, gt40p related (p for pain)

    I guess the cows got lost on their way home. You guys are hard to convince :D Maybe engines work differently on my side of the atlantic ocean: http://www.sae.org/technical/papers/2005-01-0177
  5. H

    Can of worms, gt40p related (p for pain)

    I see what what you mean, but what you really talk about is the effect of the LSA on volumetric efficiency. Of course, the more charge is trapped in the cylinder, the higher the pressure at TDC will be. However, that's not the same thing as a higher compression ratio. A wider LSA results in...
  6. H

    Spindle help!!

    The Chinese make Granada type spindles too. I saw them in a boot at the SAE World Congress Exhibition a few years ago. I tried to ask the representative of the company something about it, but his knowledge of the English language was limited (his pronouncation at least), so I didn't get much...
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    Can of worms, gt40p related (p for pain)

    Why would a reduced amount of overlap increase the dynamic compression ratio? With a wider LSA (for a given duration), the intake valve opens and closes later, so the piston has traveled further up the bore at intake valve closing and therefore start of compression. Therefore, the cylinder...
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    Anyone know the weight distribution of a 66 v8 coupe offhand?

    I stand corrected. I got my numbers from the same book ("Car and Driver On Mustang"), but looked at different tests. I actually doubt the accuracy of these numbers, as there are sometimes significant differences for very similar cars (like the last two). Note that 1% difference is about 30-35...
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    Spindle help!!

    I also thought that the early small pin spindles couldn't be that bad with so many Mustangs driving around with them, but when using my original drum spindles for a mock up of a new brake system, it turned out that the pins were bent. They pointed downwards, so the caliper didn't sit square on...
  10. H

    Can of worms, gt40p related (p for pain)

    That may be true, but that doesn't mean that increasing the LSA increases the effective compression ratio. The effective compression ratio is the ratio between the cylinder volume at intake valve closing, divided by the volume at TDC (I guess you knew that already). Making the LSA wider, retards...
  11. H

    Anyone know the weight distribution of a 66 v8 coupe offhand?

    I think that's a bit too optimistic. Road tests of the day usually listed it as 56/44 for a 289 equipped car. Big block cars were around 59/41.
  12. H

    Torsional rigidity test: 67 coupe

    Yeah, I thought it sounded light too. The FRPP catalog said "dressed", but that doesn't necessarily make it an apples to apples comparison.
  13. H

    Can of worms, gt40p related (p for pain)

    That's not correct: With a wider LSA, the intake valve is closed later, so the effective (dynamic)compression ratio would be lower, not higher.
  14. H

    Torsional rigidity test: 67 coupe

    A 2005+ Mustang 3 valve engine weights 420 lbs (dressed, not sure how much dress is included), according to the Ford Racing catalog. This surprised me, as all the other variants of the modular engine family are not exactly known as light weight. 420 lbs is only slightly more than a 289/302...
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    Can of worms, gt40p related (p for pain)

    Milling the heads should not affect rocker geometry when using pedestal style rockers because position of the valve tip relative to rocker pivot point is not changed. It will however, affect the lifter preload. The pushrod basically pushes the lifter plunger further down, by the same amount...
  16. H

    Non-mustang remanufactured steering box question

    Mavalgear makes the Unisteer rack and pinion kits for classic Mustangs. I think Unisteer is the aftermarket division or something.
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    I've read some buzz on stock 4bbl carbs.

    The 2100/4100 Autolite carbs are good, although Pony Carbs tends to exaggerate a bit, IMHO. Came to think of an interesting experiment, similar to what Pony Carbs does: use one large and one small sized 2100 carb (they came with .98, 1.01, 1.02, 1.08, 1.14, 1.21, 1.23, and the hard to find...
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    Hooker Headers, good/bad/ugly

    I gave it a bit more thought and I think it's the gas velocity relative to gas velocity at speed of sound (Mach number) that determines how restricted the flow is. When the flow reaches sonic speed, the pipe won't flow any more, regardless of the pressure difference. An intake ports/manifold...
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    F4B intake question--strange looking intake verses ones on e-bay

    The Shelby and Cobra versions of the same intake also came with both oval and round holes. My Shelby version has the oval holes.
  20. H

    Hooker Headers, good/bad/ugly

    Don't forget that you're still pushing the same mass through the exhaust pipes, regardless of temperature. The critical gas velocity (=speed of sound) goes up with temperature, so a pipe of a certain diameter isn't necessarily more restrictive to a hot gas than it is to a cold gas, as long as...
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