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Thread: Porting and Polishing

  1. #11
    Not a DeLorean Guru
    Join Date:  May 2011

    Location:  Rochester, NY

    Posts:    1,961

    My VIN:    01049

    My block is rotting, so it wouldn't be a usable engine, but you're welcome to it (sans heads) for a reasonable price if you'd like to come to Rochester to get it.

    Or with the heads for a slightly less reasonable price, lol.
    -Mike
    1981 DeLorean, heads/cams/exhaust, EFI
    1999 Corvette, heads/cam/exhaust, 440 BHP
    2005 Elise, stock
    2016 Chevy Cruze

  2. #12
    Senior Member Christian Dietrich's Avatar
    Join Date:  May 2011

    Location:  Bunker Hill, West Virginia

    Posts:    534

    My VIN:    11035

    Quote Originally Posted by opethmike View Post
    My block is rotting, so it wouldn't be a usable engine, but you're welcome to it (sans heads) for a reasonable price if you'd like to come to Rochester to get it.

    Or with the heads for a slightly less reasonable price, lol.
    You mean you will give me head..... for a price.....? Hmmm that definitely might be worth the trip! How bad is the block rot? Well I already talk to you about wanting to buy the heads from you here eventually

    Sent from my SM-N920P using Tapatalk
    Vin 11035 wide stripe, flat hood, 5 speed, Spec 1 exhaust, custom grey/black interior, custom lighting, custom stereo and custom alot of stuff!

  3. #13
    Not a DeLorean Guru
    Join Date:  May 2011

    Location:  Rochester, NY

    Posts:    1,961

    My VIN:    01049

    Quote Originally Posted by Christian Dietrich View Post
    You mean you will give me head..... for a price.....? Hmmm that definitely might be worth the trip! How bad is the block rot? Well I already talk to you about wanting to buy the heads from you here eventually

    Sent from my SM-N920P using Tapatalk
    It isn't terrible; it's just the start of it. Shoot me a PM on Facebook and we can talk details.
    -Mike
    1981 DeLorean, heads/cams/exhaust, EFI
    1999 Corvette, heads/cam/exhaust, 440 BHP
    2005 Elise, stock
    2016 Chevy Cruze

  4. #14
    Member Alex Brooks's Avatar
    Join Date:  May 2011

    Location:  Bend, Oregon

    Posts:    79

    My VIN:    10020, formerly 01955

    Club(s):   (PNDC)

    Quote Originally Posted by Christian Dietrich View Post
    My engine in 11035 has the Spec 1 exhaust/no cats mod, larger air box with a K&N filter and CAI tube and a throttle body spacer. Stock heads and cams......... for now and i will say from a seat of your pants feeling, it is definitely a night and day difference over a stock DeLorean and it is much more responsive and the throttle is much more snappier and I have no problem hitting 60mph off the line. I'd say with the mods, that im probably pushing a 25hp gain? It feels it. A good porting and polishing will probably free up between 5 to 7 horsepower it's like Mike said and you polish the seeding real well. I dunno, mabye another 30 hp with cams. I will be really interested to see someone go from a stock engine and have it dynoed then slowly do mods to it from simple bolt ons to full cams and head work to see the gains. Simply getting rid of this cars induction system and exhaust system really does make the PRV engine way better then in stock form. I know I'm loving how my setup is and I have no problem revving my car to redline at times and she pulls very nice. 200hp (engine, not wheels) can be easily done with the right tricks.

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    Christian,
    Where did you get that air box ? I would love to add it my car. Thank you Alex
    Alex Brooks
    2008 ML 350
    1985 300SD High Milage Award
    1982 DMC-12

  5. #15
    Senior Member Christian Dietrich's Avatar
    Join Date:  May 2011

    Location:  Bunker Hill, West Virginia

    Posts:    534

    My VIN:    11035

    Quote Originally Posted by Alex Brooks View Post
    Christian,
    Where did you get that air box ? I would love to add it my car. Thank you Alex
    DeLoreanAutoParts.com Glad you like it. I believe its adds a bit of performance due to the larger opening.

    Sent from my SM-N920P using Tapatalk
    Vin 11035 wide stripe, flat hood, 5 speed, Spec 1 exhaust, custom grey/black interior, custom lighting, custom stereo and custom alot of stuff!

  6. #16
    One of those purists you keep hearing about. sdg3205's Avatar
    Join Date:  May 2011

    Location:  Vancouver, BC

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    My VIN:    thirty two 'o five

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    Quote Originally Posted by Christian Dietrich View Post
    DeLoreanAutoParts.com Glad you like it. I believe its adds a bit of performance due to the larger opening.

    Sent from my SM-N920P using Tapatalk
    And with the plexiglass on the top you actually see the ponies just flying into the engine!
    Dave

    Here, somewhere.


  7. #17
    Senior Member Christian Dietrich's Avatar
    Join Date:  May 2011

    Location:  Bunker Hill, West Virginia

    Posts:    534

    My VIN:    11035

    Quote Originally Posted by sdg3205 View Post
    And with the plexiglass on the top you actually see the ponies just flying into the engine!
    It would be ponies and not horses lol!

    Sent from my SM-N920P using Tapatalk
    Vin 11035 wide stripe, flat hood, 5 speed, Spec 1 exhaust, custom grey/black interior, custom lighting, custom stereo and custom alot of stuff!

  8. #18
    EFI'd dn010's Avatar
    Join Date:  Jul 2011

    Location:  Florida: Pinellas County

    Posts:    1,194

    My VIN:    5003

    Club(s):   (DCF)

    When I had a stock engine I cut around the base of my air box (the part the filter sits in) so that there was no longer anything below the filter, no more hose, no housing, etc. and I didn't notice any difference in performance. I did have to clean the K&N filter more often though. Run it with no filter box at all and there's not a difference. The NA engine can only consume so much air, if you're looking for performance you need to start doing more expensive, involved work to the PRVs.
    Last edited by dn010; 11-08-2017 at 11:23 AM.
    -----Dan B.

  9. #19
    '82 T3 Turbo FABombjoy's Avatar
    Join Date:  May 2011

    Location:  Lansing, MI

    Posts:    540

    My VIN:    10270

    I logged MAP at the throttle edge vacuum fitting on my turbo car. At full load / WOT the I saw up to a .8bar pressure drop. So while it's possible there is some restriction in the intake it might take a draw-thru turbo to find it. Naturally aspirated I doubt you'd really find much gain on a dyno outside of the realm of measurement error.

    That aftermarket airbox deletes the PCV tube which will expose more of the air filter element to the engine, but at the expense of increased crankcase pressure at higher load. In trying to find free HP the meter flap probably is the greater enemy.
    Luke S :: 10270 :: 1982 Grey 5-Speed :: Single T3 .60/.48 Watercooled :: Borla Exhaust :: MSD Ignition :: MS3X EFI :: DevilsOwn Methanol Injection

    Console5.com - Game console parts, kits, games and more. [shop] [wiki] [RSS] [f] [t]

  10. #20
    Senior Member Grover's Avatar
    Join Date:  May 2011

    Location:  New Jersey

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    My VIN:    1494

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    I'll throw in my .02 since I have port and polished heads.

    I have a thread in the Mod section about my engine build, but long story short, with high compression pistons, port and polished heads, a 1mm shave on the heads and aggressive camshafts, my car dyno'd 147whp.

    Now, if the statement is that a Stage II is 140whp (I don't know since I haven't seen an actual stage II dyno'd), that leaves 7 extra horsepower. But, is that from the port and polish or the high compression pistons and compression raise from shaving the heads?

    I will say this, looking at my dyno graph I have a big drop in power between 3500 and 4500 RPM. The graph shows that the car leans out in that range, raising to a perfect full fuel enrichment ratio after 4500rpm. So, the engine has more air than fuel available to pump (I have raised the fuel pressure as well and the full enrichment switch is working). Because of the lean condition I had to reduce my engine timing to 15 degrees, thus losing more power.

    Because of this I plan to look into modifying the fuel system some, but that is a different topic.

    Back on topic, I know Josh at DPI has told me that they stopped port and polish when they did offer that service, saying he found it was actually worse. I have no proof to back this up. I can say that one the two cars I drove that are setup the same except for the pistons and port and polish, they have a smoother power band whereas when my fuel enrichment catches up it has a VERY noticeable kick up in torque/power (http://dmctalk.org/showthread.php?50...-Upgrade/page5 - Post #42).
    Last edited by Grover; 11-09-2017 at 04:41 PM.
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    Steve Cosgrove, Vin. 1494
    "I'm Kicking Through The Walls In My Mind..." - Goo Goo Dolls
    On-going Engine and Car Modifications: http://dmctalk.org/showthread.php?50...Engine-Upgrade

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