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jkelly

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About jkelly

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  • Gender
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  • Location
    Tehachapi CA
  • Interests
    Composite fabrication, metal fabrication, electrical systems, engine building, dirt bikes

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  1. jkelly

    P90 + Dished or Flat Top Forged Pistons

    Is this the cooling mod you're talking about? Looks like he does all six chambers, though.
  2. jkelly

    P90 + Dished or Flat Top Forged Pistons

    True! I'm starting to think 200hp would be plenty fun, for me. But I also think of how after riding a sport bike or fast car/truck for a while I always want more. So there's that. I also have a freshly rebuilt N47 head with a Stage 1 Schneider cam and fresh springs. I could continue to go the NA route for even cheaper than going turbo if all I'm shooting for is 200hp. It sounds like the safe rev range for stock internals is around 6000 - 6500rpm.
  3. jkelly

    P90 + Dished or Flat Top Forged Pistons

    Interesting post! That was a good read. I will probably stay with cast pistons, especially after doing some power to weight calculations -- that really put it into perspective. Using my 345hp vehicle (5120lb curb weight) as a power-to-weight reference the equivalent 240z power would be only 155hp.
  4. jkelly

    P90 + Dished or Flat Top Forged Pistons

    I see. I've considered building a throwaway like you mentioned, learning to tune on it, and if I destroy it I'm not out too much. The 300 number was picked from owning 350hp vehicle, albeit heavier, and thinking it would be a reasonable number for this project. I haven't driven a zcar with that much power, so you may be right and 250hp may be fun enough.
  5. jkelly

    P90 + Dished or Flat Top Forged Pistons

    I'm leaning that way for the same reason and because the paint shop 'broke the bank' and I know the engine will end up costing more than I estimated above when it's all said and done. I would probably not want to take the engine out of the car again since it would involve removing the hood and probably the fenders in order to minimizing scratching them. I would just live with whatever power it ends up making, most likely. I've read through that a few times before. It is a lot of great information, but still not really a definitive answer. From what I gather it says going with my Option 1 I should be able to get 350whp. There seems to be several ways to get to 350whp(ish). Like ZHoob2004 mentioned a lot of people say you need to go with forged pistons with anything above 300hp, but is that considering that you have a MSIII tunable management computer to control detonation? Forged does buy you extra safety margin against detonation, but detonation can destroy a forged piston/ring, too, so is it really worth an extra $1200 for this kind of build? Could I create the same peace of mind and reliability with cast pistons by ensuring I tune properly? EDIT: a word
  6. jkelly

    P90 + Dished or Flat Top Forged Pistons

    Thanks for the responses guys. This is a slow process for me, but I'm trying to figure out what direction I want to go with this engine. I'm weighing several different options from just using the pistons I have (cast flat tops) with the stock P90 head to overboring with JE flat tops and a built head (cam, race springs, etc.) from RaceTep. Again, my HP goals are mid 300s -- I think should be a pretty fun number for a weekend driver/occasional track car. I'm leaning towards Option 1 below since I already have the rebuilt head and can tune with MSIII to mitigate detonation risks and not worry too much about the cast pistons being a weak link (?). I'm looking for comments suggestions on the options below. Are options 2 and 3 overkill for the goals I have? 'Free' means I already have it. Option 1: Stock Flat Top Block and Stock Head MSIII (Free) Stock P90 head (already rebuilt) (Free) Cast Flat Top Pistons in 86.5mm (Free) ARP Hardware rods, mains, head (Free) New rings ($100) Rod and Main Bearings ($169) Turbo (T3/T04E 54 Trim 0.063 A/R) ($800) Turbo Oil Pump ($100) MLS Gasket ($150) Intercooler ($400) Machine shop work ($300, hot tank, mag, bore, deck block) Total ~$2019.00 Option 2: Forged Block and Built Head MSIII (Free) JE Forged Pistons with rings and options ($1237) ARP Hardware (Free) P90 Stainless Steel Valves ($250) Race Valve Springs ($169) Custom Cam Grind ($189) Rod and Main Bearings ($169) Turbo (T3/T04E 54 Trim 0.063 A/R) ($800) Turbo Oil Pump ($100) MLS Gasket ($150) Intercooler ($400) Machine shop work ($600, bore block and head assembly) Total ~$4064.00 Options 3: Forged Block and Stock Head MSIII (Free) Stock P90 head (already rebuilt) (Free) ARP Hardware (Free) JE Forged Pistons with rings and options ($1237) New rings ($100) Rod and Main Bearings ($169) Turbo (T3/T04E 54 Trim 0.063 A/R) ($800) Turbo Oil Pump ($100) MLS Gasket ($150) Intercooler ($400) Machine shop work ($300, hot tank, mag, bore, deck block) Total ~$3256.00
  7. jkelly

    86.5mm Flat Top Pistons

    Cast ITM 86.5mm flat top pistons in great shape. I only ran this at idle in my L28 rebuild a few times before deciding to go a different direction with the engine. How much do you think I could get for the 6 pistons (no rods, pins, or rings). Thanks,
  8. I'm converting my L28 to a turbo and using the P90 head with the stock 'B' grind cam. I currently have the block torn down and I figured while I'm in there I was going to go with all ARP hardware and also buy forged pistons (I'm looking at JEs). My question is should I go with forged dished pistons for a lower CR or go with forged flat tops? I know a lot of guys run the flat top + P90 setup with success, but a lot of the reasons behind that allude me. For a reliable weekend warrior street driven car with initial horsepower goals in the mid 300's what would be the best route? I'm buying forged pistons either way. I'm also going with a larger aftermarket turbo, intercooler, and Megasquirt III.
  9. jkelly

    1975 280z Part Out, bushings, and more

    Yes, I do still have them. PM me if interested.
  10. jkelly

    86.5mm L28 piston rings

    Does anyone have a source for 86.5mm piston rings for L28 flat tops? I can find them for 280zx pistons (not sure of the difference) but not my L28 flat tops with a 0.5mm over bore.
  11. Front bumper, crash bar, and front rubber bumpers are sold.
  12. Bump. Price dropped on the N47 head again. I also have shipping estimates for bumpers now. Waiting to hear back from original posters.
  13. Got it. I'll let you know. I'm waiting to get my new bumper box from the body shop so I can measure dimensions and get 1978280z5spd a quote
  14. Back in town now. Will follow up on this. Also, priced reduced on the N47 head above.
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