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Recent content by ShaunT

  1. ShaunT

    valve to piston clearance in hi-performance engine

    Excessive piston to bore clearance will hurt the V.P clearance when the piston rocks out of the bore at TDC from the lack of support. Another area of valve train lingo you need to check if you havn't already. That is the Intake and Exhaust Centerlines. I.E. where the cam is degreed to in the...
  2. ShaunT

    Sooty spark plugs

    I agree to believe the plug. If this is a drag car, tune for the best time slip. Though it is likely not the case here, something else to consider is Ra's, Rvk's, Rz's, etc of the cylinder wall surface finish. I would look into that if you haven't already, anyway because I am sure you will find...
  3. ShaunT

    383 TBI Chevy

    Mike, if I were in your position, I would very seriously look into purchasing a Whipple. Call'em at 559-442-1261. They have a fantastic piece for you. Shaun TiedeULTRADYNE/LUNATI Austin,TX(stiede@ev1.net)
  4. ShaunT

    Cam profile design

    I guess I have made myself sound really Arrogant. I just don't have too high of an opinion of other cams. I feel that a product that has to be marketed to death with a couple of $Mill/yr shows it is inadequate. To some, I come accross as biased. I feel that is easy for one to think that untill...
  5. ShaunT

    Cam profile design

    I don't produce over head cams. The tooling to manufacture is quite different. Let me do some checking. The head could benefit from a trick 4 or 5 angle C.N.C valve job using a machine such as a Newen GII. The goal is to keep intake seat angles about .038 wide and exhaust about .060. Back...
  6. ShaunT

    Cam profile design

    Valve spring tech has certainly come a long way in the last ten years. I used to avoid designing some cams that were mostly ideas because I knew there wern't spring available at the time to handle the job. To an extent, cams have evolved from the advances in springs, too.
  7. ShaunT

    Turned down crank journals

    Way to go METALGUY!!! SOme folks are so trick hey out trick themselves. It is pretty easy to spot the ignorant ones. They are the ones who will try anything. Why don't they play with a cam and maybe a head or two? I guess you could get a really good education about cranks by turning to Callies...
  8. ShaunT

    friction reduction in ring and pinion

    V.P. Racing Fuels offers a very low visc. oil. I know it is very expensive as far as gear oil goes. You have to buy a pretty large quantity to get it. Maybe you hsould look into it. Shaun TiedeULTRADYNE/LUNATI Austin,TX(stiede@ev1.net)
  9. ShaunT

    Cam profile design

    There will be some wear in. The surface roughness averages are different from the lobe and the lifter. They will lap into each other. There will also be a pattern worn based on where the lifter is contacting the lobe. This can be influenced by lifter bore angle, and wether or not the cam is in a...
  10. ShaunT

    Cam profile design

    On the subject of cam profile design as it relates to making cylinder pressure and how this affects performance. The single most critical element of the cam in this scenario, is the actual point the Intake Valve closes(degrees after BDC) When an intake valve closes, compression begins. Even...
  11. ShaunT

    Cam profile design

    Cam profile design. What about rocker arm geometry and fulcrum points? You can and should always check rocker/push rod geometry anytime a cam is changed or the heads/block is worked. It will take some drag off the motor, and it will save the guides and valve job. As for fulcrum points, it is...
  12. ShaunT

    383 TBI Chevy

    The 6.00 Inch rod is the best way to go. It greatly helps the restricted induction feed the motor. You will need a reduced base circle cam with a longer push rod, and you will have to notch the bottom of the cylinders to clear the rods. Scat makes a great budget I-Beam rod for a couple of bills...
  13. ShaunT

    Cam profile design

    I wish to stress something that I have said before, but a bit off the subject from the last few postings to this thread/subject. As Intake Port volume increases in addition to utilizing longer connecting rods, but not running a longer stroke crank( I.E. higher rod to stroke ratio) one needs to...
  14. ShaunT

    Spark plug "indexing"?

    We all appreciate curiosity. Hey Larry Meaux: Got tons of your customers. Know Ronny Mallett? There are also a few who visit us on Eng-Tips. C'ya, Shaun TiedeULTRADYNE/LUNATI Arl,TX(stiede@ev1.net)
  15. ShaunT

    Leaded vs. Unleaded Gas

    Back in the 70's before the EPA banned Lead from pump gas, this exhaust system rusting was widespread. I experienced it along with several of my friends in the 80's when we would run our street cars on leadded fuel exclusively. However, today I don't have that problem since I can't run lead on...
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