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Re: Flat tappet and valve spring pressures. [Re: atoetly] #14263 02/11/05 10:09 PM 02/11/05 10:09 PM
Joined: Feb 2004 Posts: 1,417 Chicago, IL blownEFI pro stock
blownEFI pro stock Joined: Feb 2004 Posts: 1,417 Chicago, IL	Quote: If your part of the in crowd (I'm not) you will hear run a roller. But not from me. I'm not into the cookie cutter engine crowd. Roller lifters belong in a pratt&whitney 1340 radial engine. This had outa get some responses right b1ken? Lol I think I'd rather have a Pratt & Whitney R-4360 Wasp Major. With 5.75" bores and a 6.0" stroke times 28 cylinders for a total displacement of 4,363 c.i. and producing 3,000 horsepower at only 2,700 rpm. Now that was one bad engine. "These go to eleven", Nigel Tufnel

Re: Flat tappet and valve spring pressures. [Re: blownEFI] #14264 02/11/05 11:32 PM 02/11/05 11:32 PM
Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey J jamesc master
jamesc master J Joined: Jan 2003 Posts: 5,875 communist bloc of new jersey	hmmm...can't say that i can add much the 275/275-585/585 cam in the sig car isn't real rowdy though it does have some duration. it was installed with whatever springs comp recommends for it (i think) and broken in with full pressure. i believe these are in the 140/360ish area. when first raced i had one exhaust rocker that needed adjustment a number of times and i said one more time and i'm parking it but it settled down and the valve train has been holding lash better than i ever expected. i had checked the lift with a dial indicator and it looked ok. one point to mention though i have no experience (fortunately) it that i would think if the lobe/lifter starts to fail it isn't gonna take long to finish off.

Re: Flat tappet and valve spring pressures. [Re: blownEFI] #14265 02/12/05 06:22 PM 02/12/05 06:22 PM
Joined: Jun 2004 Posts: 1,226 Peoples republic of clackamas ... A atoetly pro stock
atoetly pro stock A Joined: Jun 2004 Posts: 1,226 Peoples republic of clackamas ...	I think I'd rather have a Pratt & Whitney R-4360 Wasp Major. With 5.75" bores and a 6.0" stroke times 28 cylinders for a total displacement of 4,363 c.i. and producing 3,000 horsepower at only 2,700 rpm. Now that was one bad engine. Yes but at the cost of 20 dollars a piece minimum for spark plugs and just walking past a radial engine you will look like a grease rag. Not to mention those old engines are maintence hogs (But they do have roller lifters and a floating cam ring) I really think I will just stay with my flat tappet 440.

Re: Flat tappet and valve spring pressures. [Re: atoetly] #14266 02/25/05 01:10 PM 02/25/05 01:10 PM
Joined: Jan 2003 Posts: 4,045 Shelby Twp. Mi HardcoreB OP master
HardcoreB OP master Joined: Jan 2003 Posts: 4,045 Shelby Twp. Mi	Would like to put this one to bed so, does anyone have anything else to add? All responses are appreciated.

Re: Flat tappet and valve spring pressures. [Re: HardcoreB] #14267 02/25/05 01:13 PM 02/25/05 01:13 PM
Joined: Jan 2003 Posts: 4,045 Shelby Twp. Mi HardcoreB OP master
HardcoreB OP master Joined: Jan 2003 Posts: 4,045 Shelby Twp. Mi	Quote: I am curious to know if any of the applications that require pressures beyond 380 lbs. over the nose are using steel retainers and or mufflers (backpressure). What dia. pushrods and wall thickness in those applications? Are the applications exceeding 380 lbs. (nose) with success using synthetic oil after the break-in period? Does anyone want to touch on these?

Re: Flat tappet and valve spring pressures. [Re: HardcoreB] #14268 02/25/05 01:17 PM 02/25/05 01:17 PM
Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually B BradH Taking time off to work on my car
BradH Taking time off to work on my car B Joined: Jan 2003 Posts: 15,439 Val-haul-ass... eventually	Quote: Quote: I am curious to know if any of the applications that require pressures beyond 380 lbs. over the nose are using steel retainers and or mufflers (backpressure). What dia. pushrods and wall thickness in those applications? Are the applications exceeding 380 lbs. (nose) with success using synthetic oil after the break-in period? Does anyone want to touch on these? Steel retainers are OK; I happen to run ti on the intakes and steel on the exhaust to help bring the intake valve assembly weight down much closer to the exhaust valve assembly weight. Pushrod wall thickness of at least .065" w/ a 3/8" tube... .080" walls probably better, though. Synthetic oil OK for me, but I like the high-end Redline stuff, not Mobil 1. Also, as I may have mentioned previously, I do run Schubeck lifters.

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