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Are V8s often "interference" motors ?

Discussion in 'The Hokey Ass Message Board' started by Dan Timberlake, Aug 7, 2012.

  1. NielsK
    Joined: Jan 16, 2008
    Posts: 197

    from Denmark

    Naaahhhh . . . One for the heater and one for each wheel, thats easy :)
  2. pitman
    Joined: May 14, 2006
    Posts: 5,109


    Sa-aaab-a-Babaaab-a-Babaaab as it goes down the road. :p
  3. Mike VV
    Joined: Sep 28, 2010
    Posts: 2,443

    Mike VV
    from SoCal

    Paverguy -

    You are "partially" correct.
    The stock passenger car Stude engine was a fiber cam with a steel crank gear.
    The "R" series Avanti engines had aluminum cam gears with steel crank gears.
    The trucks had aluminum cam gears and steel crank gears.

    I'm having adjustable cam gears made up for the Stude V-8 engine that are both steel, cam and crank.

    I believe most American made V-8s (anyway), at least thru the late 80's were interference engines. I'd say that with the combustion chamber shapes of the factory high performance engines of today dictate that they are also crash engines.

  4. Ghost of ElMirage
    Joined: Mar 18, 2007
    Posts: 758

    Ghost of ElMirage

  5. HamD
    Joined: Mar 3, 2011
    Posts: 298


    Not without a stout cam, they're not.
  6. Ken Carvalho
    Joined: Dec 22, 2004
    Posts: 1,607

    Ken Carvalho

    NO DISRESPECT to the O/P, but,
    Oh My God!!! Dont know how to put "that" smiley in my post but thats funny as fuck!!!
  7. paverguy
    Joined: May 6, 2011
    Posts: 14


    Well , I did say that Stude V8s had a Fiber gear .
    Yes , the crank gears are steel.
    Some Studes , ie HD- option trucks , taxis etc had Aluminum timing
    gears beginning in 1961 , and this was used in the Jet Thrust R series engines.
    There was a 6 cyl Aluminum gear available also.
    Most , and that is a high most , had the fiber gear.
    The discussion was about interference , and I cited an example that I personally
    experienced on a V8 that had been somewhat abused by being operated as a V4 for
    many miles.
    Last edited: Aug 9, 2012
  8. Bruce Lancaster
    Joined: Oct 9, 2001
    Posts: 21,682

    Bruce Lancaster
    Member Emeritus

    Little known factoid: A flathead Ford will blow the vacuum wipers through one cycle as it rolls silently to a stop when teeth let go. This is puzzling in the extreme when you have no idea what is going on...
    Otherwise...nothing happening beyond the departed teeth!
    Silly idea putting the valves and all that extra junk up top where they will be damaged!
  9. Dan Timberlake
    Joined: Apr 28, 2010
    Posts: 1,331

    Dan Timberlake

    As best I can recall, as I strain to travel through time and space there's a strong physical resemblance here, except aunt Joanne wore a lot more spangly jewelry, and had fewer tattoos.,tatoo-6e3c305142dab963daad2791c889c0ea_h.jpg

    Perhaps some might say a little broad through the withers, She made an impression on her 19 year old nephew (me) . She was a smart, kind, sassy lady, so her hotness was ( and probably still is ) more than skin deep.

    She brought her nearly new consistently rough running but not clackety Mustang to our house for me to look at. It was much (years?) later that the younger brother ratted out the older brother's down shift stunt. I never heard what the repair included, but still presume he had succeeding in floating the (302's ?) valves badly, and probably a few got bent. A completely pumped up hydraulic lifter could only hold the valve about 1/16 or maybe 90 thou' further open, so either the cam tossed the valve sky high beyond max lift for the piston to tennis serve at TDC , or the running V-to-P clearance is on the order of 1/8 inch.
    They look pretty close here, even knowing the stock piston has notches.

    FWIW, this Buick, too.
  10. Atwater Mike
    Joined: May 31, 2002
    Posts: 10,707

    Atwater Mike

    In my busy shop days, I had customers that had 'second' cars, besides their Porsches, Mercedes, and BMWs.
    A few times I was asked to 'just take a look' at various cars that other shops had fixed.
    A couple had plastic timing gears that had failed, and the shop they took it to just replaced the had to pull the heads, and replace bent valves.
    Both of these previous repairs came to me later, as I agreed to see why the loud knock a week siezed up.
    Pulled the pan, all those little pieces of plastic teeth were ground up like Grape=Nuts, and sucked up into the oil pump pickup screen...
    Spun 2 con rod brgs., one broke a rod in two, right thru the cylinder wall.

    Technically, these became 'interference engines': They interferred with my normal mode of business, and the con rod interferred with the cylinder wall.
  11. Von Rigg Fink
    Joined: Jun 11, 2007
    Posts: 13,426

    Von Rigg Fink
    from Garage

    I do know if you push any engine too hard,sooner or later, it will interfear with your wallets abilty to hold cash
  12. Oldsmell
    Joined: Jul 17, 2012
    Posts: 48


    Dude we gotta see your aunt
  13. H.G. Wells
    Joined: Mar 11, 2006
    Posts: 386

    H.G. Wells

    I have a BBC where the spark plug will interfere with the piston if it is not indexed with ground strap on top. Does that count?

    Try going to an O'Reillys and asking the counter kid for indexing washers.
  14. nrgwizard
    Joined: Aug 18, 2006
    Posts: 1,415

    from Minn. uSA

    Hey, paverguy;

    Get the v4 Stude from Dick Datson, or someone who subscribed to his newsletters?
    Dick was in Bradington (sp?) Fl area, for a long while.

    Was a decent concept, & he got a *lot* further than most others did, using a whole lot less $$$, but more ingenuity & thought. That v4 spawned a lot of ideas, that led to some rather interesting conceptual discussions, not to mention experiments... :D .

  15. paverguy
    Joined: May 6, 2011
    Posts: 14


    The idea of the V4 was Dick's, with my help. I had done some research along the idea, and had even found an old article showing a part time Cadillac V8/4 that was controlled with a ball valve and cable.
    The car was mine , and I still have the pieces necessary to do it. It wasn't perfect , but this was during the 70's fuel crisis days , and it was fun. The car was an automatic Lark
    and 0-30 mph was pretty slow , but above that was good. In today's world a modern trans would go a long way . I used to go around looking for Peugeot diesels to drag against at the streetlight.
    I later put a 4:11 rear in the car , and it improved a lot at the low end.
    At cruise speeds , it was fine , and on one 250 mile trip with 4 people on board , I recorded about 31 mpg.
    I removed the factory fan as only 4 cyls were making heat and got that precious 5 hp or so back.
  16. pila38
    Joined: Mar 25, 2009
    Posts: 765


    You're right, your aunt is pretty hot!
  17. Mike51Merc
    Joined: Dec 5, 2008
    Posts: 3,856


    You're asking the phone receptionist technical questions and you're calling HER crazy?
  18. Zerk
    Joined: May 26, 2005
    Posts: 1,418


    B21, B23............Noninterference
    B230..................Some books say interference, but not in my experience.

    My '76 245 was a killer workhorse and daily driver. I'm guessing it went to over 300K miles before a rod went through the block.

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