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Looking for 360 Build Ideas |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5808 |
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While roller cams solve the issue of wiped cam lobes, they are not without risk, plenty of modern engines with OEM roller cams suffer from lifter failure.
I had a roller lifter break the metering plate in the lifter, this of course can happen with a regular hydraulic flat tappet lifter, but they are a high dollar part, so if something does go wrong it is a costly part to replace as well.
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I've finally given up drinking for good...........now I only drink for evil.
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Anything cam fail at anytime whether stock or upgraded. Chances are, hydraulic roller lifters and typical spring pressures associated with them will last for many years.
I've used flat tappet cams up until about one year ago and they work great when they do not fail. Like I said earlier, in my position, for the money it costs to use a roller, its not worth chancing flat tappets anymore.
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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WesternRed
AMC Addicted Joined: Aug/03/2010 Location: Australia Status: Offline Points: 5808 |
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Yes, it does seem like making flat tappet lifters is now a lost art. I can understand not wanting to get caught up in a warranty issue, which is going to be on your hands and not the lifter manufacturer’s. It’s a shame it just gets more expensive to keep our old cars going.
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I've finally given up drinking for good...........now I only drink for evil.
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3322 |
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So what changed with flat tappets one year ago?
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LakesideRamblin
AMC Addicted Joined: Dec/21/2015 Location: So. California Status: Offline Points: 2694 |
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Edited by LakesideRamblin - Aug/10/2022 at 12:21am |
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LakesideRamblin
69 Rambler 360 73 Javelin 360 "If you could kick the person in the pants responsible for most of your trouble, you wouldn't sit for a month." T. Roosevelt |
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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Lost cams in three engines. One of them was the low compression 360 posted earlier.
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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sweatlock
AMC Addicted Joined: Apr/28/2014 Location: Largo, FL Status: Offline Points: 3322 |
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Um, mine was built about a year and a half ago (February 2021) with a Bullet cam with flat tappets. 254/267 deg. advertised duration, 206/214 @ .050, .490”/.510” lift, 113* LSA, installed at 109*
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Mr_Roboto
AMC Apprentice Joined: Jun/12/2022 Location: Wisconsin Status: Offline Points: 221 |
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Stout cams or mild? Also what brand lifters, or were they different.
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jcisworthy
AMC Addicted Joined: Jul/23/2009 Location: North Carolina Status: Offline Points: 2805 |
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One was a Bullet cam with Johnson lifters, the other two were mild MT1-A with Elgin lifters. Elgin said it was not their lifters because they did not have .904 cores for a year prior so who knows what brand was in the box.
One baby cam with 85/260 closed and open wiped hard on the run stand I had at the time and one made it 300 miles after making it off the run stand. The Bullet wiped on the local dyno I was using at the time Lifter to bore clearance was fine on all, oil primed before start up, fired right up. I think the Bullet cam had 330-340 open but not positive
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Specializing in dyno services, engine building, and cylinder head porting
rbjracing.com Phone Number 518-915-3203 |
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Mr_Roboto
AMC Apprentice Joined: Jun/12/2022 Location: Wisconsin Status: Offline Points: 221 |
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Uggh, was afraid you'd say something like that. Kind of sucks because I'm going to play with an L6 and they don't even have a roller option far as I know. May be different if I could discard it as being just too aggressive of a cam.
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