BB Wiped Cam!
Drifting
Joined: Oct 2005
Posts: 1,527
Likes: 148
From: East London/SW Essex UK
Interesting thread...my BB engine is in the shop right now with a wiped out cam lob. It will be interesting to find out what lob or cylinder it is. The cam that was in there was some type of Comp Cam.
I'm going back with a roller setup. My engine has all original parts and would still be running if the PO has not swapped the cam out. My builder is recommending a Comp Cam for replacement, we'll see!
Kevin
I'm going back with a roller setup. My engine has all original parts and would still be running if the PO has not swapped the cam out. My builder is recommending a Comp Cam for replacement, we'll see!
Kevin
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
One of the issues with 'replacement' of flat tappet cams with roller items I believe could be excessive 'lift' (certainly if planning to use existing valve/spring set-ups) - most of the 'hotter' solid roller cams seem to have far higher lift pro-rata than their flat tappet equivalents - lower lift options seem to be limited.
Drifting
Joined: Oct 2005
Posts: 1,527
Likes: 148
From: East London/SW Essex UK
Know what you mean - but higher lift is surely only a benefit if your heads can flow anything additional from the extra lift - heads on mine are Brodix Race Rites on 489 cu in - factory quoted intake flow @ .500" lift = 314 cfm - .600" lift = 334 cfm - .650" lift = 336 cfm - .700" lift = 340 cfm. As you can see there is little benefit in going above .600" lift. I see the roller advantage in being able to use far more aggressive opening and closing ramps on the cam and maximising flow benefits at a lower lift (valve overlap permitting). It seems that only Crower offer as stock 'street' solid roller cams with lower lifts.
Last edited by roscobbc; Sep 2, 2013 at 01:45 PM.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Know what you mean - but higher lift is surely only a benefit if your heads can flow anything additional from the extra lift - heads on mine are Brodix Race Rites on 489 cu in - factory quoted intake flow @ .500" lift = 314 cfm - .600" lift = 334 cfm - .650" lift = 336 cfm - .700" lift = 340 cfm. As you can see there is little benefit in going above .600" lift. I see the roller advantage in being able to use far more aggressive opening and closing ramps on the cam and maximising flow benefits at a lower lift (valve overlap permitting). It seems that only Crower offer as stock 'street' solid roller cams with lower lifts.
Last edited by bluedawg; Sep 2, 2013 at 02:16 PM. Reason: shittty spelling and third grade punctuation.
Thread Starter
Burning Brakes
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
Comp Cam kit 268H High Energy was used in his motor.When I was researching for my new roller cam,found out not all cams are created equal.Before you purchase find out if the cam is a billet core or not.My Crane Cam was ground on a billet core with pressed on iron dist gear.in this pic you can see the difference....
[IMG]
[/IMG]
[IMG]
[/IMG]
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
Drifting
Joined: Oct 2005
Posts: 1,527
Likes: 148
From: East London/SW Essex UK
Comp Cam kit 268H High Energy was used in his motor.When I was researching for my new roller cam,found out not all cams are created equal.Before you purchase find out if the cam is a billet core or not.My Crane Cam was ground on a billet core with pressed on iron dist gear.in this pic you can see the difference....
[IMG][/IMG]
[IMG]
[/IMG]
Thread Starter
Burning Brakes
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
Here you go..[IMG]
[/IMG]
No special dist gear needed.Need to use a different fuel pump pushrod rod,I'm using a Howards polymer rod.Don't like the bronze tip or roller type.
[IMG]
[/IMG]
[/IMG]No special dist gear needed.Need to use a different fuel pump pushrod rod,I'm using a Howards polymer rod.Don't like the bronze tip or roller type.
[IMG]
[/IMG]
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
Billet core with press-on cast iron dizzy gear is the way to go. Most off-the-shelf comp cams are NOT billet core. Lunati uses billet cores on their roller Voodoo line. I have the Voodoo 231/239 h-roller in my 454 and it's a sweet cam.
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
268H, eh? Damn, that blows my theory right out of the water. I had been starting to notice that almost all of the wiped cam sob stories involve cams with very high hydraulic intensity, like the Xtreme energy cams. But the 268H is fairly mild.
Scott
Scott
Le Mans Master
Joined: Nov 2006
Posts: 7,215
Likes: 1
From: Orlando FL
wow that sux
always sad to see premature engine component failure.I have noted some trends-
people use the wrong lube when installing
people fail to follow the break in procedure set forth by manufacturer
people fail to change the oil after break in
people put crazy oil in there engine (I will not say anything more on this. To each his own)
Le Mans Master
Joined: Oct 2010
Posts: 6,930
Likes: 845
From: melbourne florida
2023 C3 of the Year Finalist - Modified
isn't it strange, now we are finding out that even roller cams benefit from zink in the oil, and a member here has insisted it isn't needed. i agree with the necessity of proper installation practice and proper break in. it seems even then there are no guarantees. i feel bad for the o.p it is disheartening to have to redo something that both planning and execution take such time.
Team Owner
Joined: Jul 1999
Posts: 65,492
Likes: 230
From: Orange Park Florida
Enyone ever have a bad ROLLER cam, ??? I have, and to boot the engine would smooth out just fine along about 1200 rpm, but the idle at 800 rpm was ragged as a doll, BUT every once in a while the idle would smooth out and be fine.....it was very erratic in the acting up, this went on for years, ME going nutz with the injectors, HEI, computer, chips, and of course the computer looked good in all aspects....this drove me krazy, I got another stock L98 cam from a friend, and changed it out more for the economy than anything......upon pulling the ZZ9 TPIS cam out of the engine, I was shocked to see all the destruction on 1/2 the lobes, I examined the roller lifters really close, and they were perfect, smooth all over looked new.....the Cloys double roller chain was perfect too, changing the cam solved all the ragged intermittent idle problems....
so never buy anything from TPIS, they located in Chaska Minn.
I would not be too surprised to see other guys with defective lobes on roller cams too, somehow that junk gets sent out of some shops.....
the lobs looked as if the steel had delaminated or something, looked like it had pits all over, also....
so never buy anything from TPIS, they located in Chaska Minn.
I would not be too surprised to see other guys with defective lobes on roller cams too, somehow that junk gets sent out of some shops.....
the lobs looked as if the steel had delaminated or something, looked like it had pits all over, also....
Drifting
Joined: Jan 2012
Posts: 1,908
Likes: 129
From: Fredericksburg Virginia
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
I could be wrong here Scott, but the 268 doesnt have the lift that we been seeing in flattapet cams failures, but i think most BBC's run 1.7 to 1 rockers which would add to the stress on the lobe.
Last edited by bluedawg; Sep 4, 2013 at 12:58 PM.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
No, a billet core would trash flat tappet lifters. But there is a premium flat tappet core. P55 or something like that? I forget the name of it.
Safety Car
Joined: Jan 2009
Posts: 3,736
Likes: 56
From: anchorage ak