Re: roller vs mechanical flat tappet cam?
[Re: carolinacuda]
#1260934
07/02/12 06:11 PM
07/02/12 06:11 PM
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Joined: Jan 2003
Posts: 3,575 The Netherlands
BigBlockMopar
master
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master
Joined: Jan 2003
Posts: 3,575
The Netherlands
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You only have to wipe one lobe on the flattappet cam to remind you why you made the mistake of not going with a roller in the first place A roller costs a good deal more, but it also takes away the annoying halfhour break-in period of a fresh engine or cam install. Oil selection becomes a little less critical aswell. You can just start the engine, set timing and carb adjustments and then break in the rings during a couple of firm drives around the block.
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Re: roller vs mechanical flat tappet cam?
[Re: Cab_Burge]
#1260937
07/02/12 06:35 PM
07/02/12 06:35 PM
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Joined: Jan 2003
Posts: 10,016 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,016
Frostbitefalls MN (Rocky&Bullw...
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There are street friendly grinds available that don't require race spring pressures and if i am right some that don't need the bronze gear? Call a couple of the cam company s and tell them what you want and you should come up with some solid advice and a setup that will last a lot of miles. You will like the extra power and roller cams have a little more bottom end torque because they have faster opening rates and don't need quite as much total duration for the same power band.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: roller vs mechanical flat tappet cam?
[Re: Jonnyj00]
#1260942
07/02/12 06:58 PM
07/02/12 06:58 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
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Posts: 52,972
Romeo MI
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Quote:
Well this whole question was brought on becuase of the additive... We tried running a solid flat tappet with royal purple full synthetic and took some lobes off the cam . Should have known better. This car runs the 1/8 and we shift at 5500 and runs 7.20 consitantly or should I say ran... Its just a 440 that had a .590 purple shaft. Ran good and consistant had no complaints with performance. We dont really wanna turn that many Rs because we dont wanna spend the money to do so lol. So it sounds to me like unless we wanna turn mor RPM stick with the flat tappet and just keep the cam lube in stock.
A roller will make more power and if you keep the duration down you dont have to spin it higher and no you dont need additives... if the bottom end can turn higher and you have the flow I would turn it higher... RPMs make HP if your set up for it
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Re: roller vs mechanical flat tappet cam?
[Re: gregsdart]
#1260943
07/02/12 07:01 PM
07/02/12 07:01 PM
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Joined: Dec 2009
Posts: 161 SE Iowa
Jonnyj00
OP
member
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OP
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Joined: Dec 2009
Posts: 161
SE Iowa
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Quote:
Quote:
Well this whole question was brought on becuase of the additive... We tried running a solid flat tappet with royal purple full synthetic and took some lobes off the cam . Should have known better. This car runs the 1/8 and we shift at 5500 and runs 7.20 consitantly or should I say ran... Its just a 440 that had a .590 purple shaft. Ran good and consistant had no complaints with performance. We dont really wanna turn that many Rs because we dont wanna spend the money to do so lol. So it sounds to me like unless we wanna turn mor RPM stick with the flat tappet and just keep the cam lube in stock.
Do you check for lifter rotation before you fire the motor? If any of them aren't rotating, put 500 grit sandpaper in the palm of your hand and rotate the base of the lifter in it till you can see that it is scuffed a bit. Test for rotation again. With the right oil, you should be fine.
Are you talkin about for engine break in? If you are thats the most pathetic part about our problem lol is this motor has been together for years we just didnt have any cam addative and decided to try and take a chance with royal purple with out the addative. If your not talking about break-in please elaborate im curious as to what you mean?
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Re: roller vs mechanical flat tappet cam?
[Re: Jonnyj00]
#1260945
07/02/12 11:07 PM
07/02/12 11:07 PM
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Joined: Oct 2003
Posts: 7,506 Az
Crizila
master
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master
Joined: Oct 2003
Posts: 7,506
Az
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IMO, rollers are over priced and over marketed ( Gods gift to performance ). For all out high end race engines, yes - other wise, they are just a bragging crutch. The additional weight you have to deal with offsets other advantages below .650 lift IMO. I have run a flat tappet cam with well over .600 lift for going on 4 years now ( using Royal Purple full synthetic BTW ) with zero problems. The larger .904 lifters used in Mopar motors is a real advantage for running aggressive flat tappet cam profiles also.
Fastest 300
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Re: roller vs mechanical flat tappet cam?
[Re: Crizila]
#1260946
07/02/12 11:41 PM
07/02/12 11:41 PM
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Joined: Jan 2003
Posts: 27,421 Balt. Md
383man
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 27,421
Balt. Md
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I went with a solid flat tappet in my car. I use the EDM lifters with the small hole in the bottom for oil to the lobe. I checked all my lifters for rotation before I started it. I use Valvoline racing oil and a zinc additive. No problems at all. I did break the cam in on just the outer springs. With a roller I did not want to worry about valve float if it did not have enough spring pressure and I did not want to worry about a lifter breaking with the high spring pressure they use. I drive my 63 on the street alot and felt the flat tappet would be best for me. Ron
Last edited by 383man; 07/02/12 11:43 PM.
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Re: roller vs mechanical flat tappet cam?
[Re: BigBlockMopar]
#1260951
07/03/12 02:08 AM
07/03/12 02:08 AM
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Joined: Jul 2004
Posts: 1,145 Arizona, USA
gsmopar
super stock
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super stock
Joined: Jul 2004
Posts: 1,145
Arizona, USA
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Quote:
You only have to wipe one lobe on the flattappet cam to remind you why you made the mistake of not going with a roller in the first place
I lost a lifter and wiped out my roller cam. I don't think that this is a good argument for either cam.
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