Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

Register Log in
  • Congratulations cowski on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

Recent content by tstom

  1. tstom

    Billet alum head for diesel tractor puller?

    I think I am leaning away from the alum ....This will be too much work to have to redo it 3 pulls into the season...while that may or may not happen the aluminum was my idea. The customer wants steel so I don't think I'll talk him out of it. I didn't realize cast iron would be an option for a...
  2. tstom

    Billet alum head for diesel tractor puller?

    Was planning a 2 valve design to keep rockers simple and be able to transfer Jesel type rockers to this design Pat is correct that high spring pressures are needed however the cyl.bore size is 5.120" so this allows me room for seat inserts with a beefy o.d. and still have the needed valve size...
  3. tstom

    Billet alum head for diesel tractor puller?

    I hear of guys using steel billet heads and questioned why alum. won't work Stout1 is correct in that the overall weight may not be a concern but where it is placed is important...so lighter parts allow more flexibility in weight placement how ever that is not my main issue I just am not...
  4. tstom

    Billet alum head for diesel tractor puller?

    Ease of machining... What other options should I consider?
  5. tstom

    Billet alum head for diesel tractor puller?

    Would be interested in opinions on whether a solid billet aluminum head would live on a John Deere diesel puller engine. The pull lasts about 40 to 50 sec.Occasionally they have to rerun in a "pull off" tie breaker They now run a ported stock cast iron head that has the water jackets filled...
  6. tstom

    NOS Control

    Fred, Are they manufactured by NOS? Maybe you could email me a picture, particularly of the tip tom@hemphillracingengines.com Tom
  7. tstom

    NOS Control

    Fred, There are basically four type of NOS nozzles We can narrow it down like this if the nozzles are black in color they are either an "A" nozzle or a "B" nozzle the A's have a V shaped notch on the discharge end the B's have two small holes , one angled, one...
  8. tstom

    NOS Control

    Fred, A 102 gas jet is definitely not right regardlees of what nozzle you have Your assumption that a 32 nos jet is about 270 to 300 hp is pretty close for 150 to 200 try a 24 nos jet and a 20 fuel jet but before you do this please describe to me which nozzle you are using... NOS has about 4...
  9. tstom

    Turning vanes in intake ports on cyl head?

    What we find concurs with what Pat and Andy have said there is no universal vane design that will work on all heads (jump in here any time Larry M)I suspect that the vanes do more to redirect liquid than redirect air or maybe a better way to say that is they change the pressure in that part of...
  10. tstom

    NOS Control

    Fred, I think you will find more gains by turning your nitrous on full much sooner in the run At that power level the only reason to ramp the nitrous would be traction problems even so you would be better of to run a smaller shot and turn it on sooner To see the logic of this compare your...
  11. tstom

    Using O2 sensors to tune a running engine

    I'm going with enginehead on the egt's we dyno a lot of engines and use egt's in every cylinder and we find them to be of very little use for fuel curve tuning I think as enginehead has said they are affected by too many other things We have seen engines with 1000 deg F egt burn pistons because...
  12. tstom

    NOS

    grogg That is how most high horsepower nitrous systems are configured many have as high as three nozzles per runner BE VERY CAREFUL a system like this is capable of destroying even the best racing engine in one run You need top quality parts that are designed for nitrous use and an...
  13. tstom

    Piston ring end gap (your thoughts)

    Allen The rings were not coated but the garden variety Speed Pro file fit plasma moly The particular engine I spoke of had a 1/16 top and second ring with a 4.375 bore dia On bigger bore dia we prefer .043 top rings to further reduce the ring weight and now as I read IvyMike's post I...
  14. tstom

    Piston ring end gap (your thoughts)

    The thing we see in racing engines is that when the engine speed goes up the inertia of the top ring increases to the point where it wants to lift off of the bottom of the land We machine our gas ports in more of a fashion to hold the ring down rather than out First saw this on the dyno with a...
  15. tstom

    Reason for increasing rod big end side clearances?

    We build a lot of small block Chevys with Eagle rods and .022" to .025" is a pretty normal side clearence you won't have any trouble set your rod brg clearence at .0025" and it will run for a long time The little Chevy has a simple yet very effective oiling system We have had drag...
See more

Part and Inventory Search

Back
Top