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Author
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Topic: Variable Duration lifters
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Mpcoluv
Gearhead Posts: 1341
From: Charlotte NC usa
Registered: Apr 2001
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posted 01-24-2002 01:13 PM
   
Hi,
I currently have 10.5" of vacuum at idle with my 372C. I am planning on retrofitting a power booster to my car. It seems that my vacuum is a little too low for power brakes.
Have any of you (Alex) ever tried the Crane variable duration lifters? I believe that these lifters have a lower bleed rate and lower noise than the Rhodes.
How much extra vacuum can I expect with these lifters?
Are there any problems associated with these lifters?
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SteveLaRiviere
Administrator Posts: 45869
From: Saco, Maine
Registered: May 99
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posted 01-24-2002 02:53 PM
My Rhodes lifters don't make any noise that I can hear over the headers.------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
MCA Member # 47773
My favorite tool is Occam's Razor
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 01-24-2002 03:31 PM
We have sold several sets of the Crane VDL and had no complaints. I have installed several sets of the Rhodes lifters and always had good success. Unfortunatly unlike Steve, every set we have installed were very noisy. Not quite like solids, but slushy. They have especially bad morning sickness also. One of theese days we will install a set of the Cranes and see for ourselves.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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SundanceKid
Gearhead Posts: 1274
From: UT
Registered: Feb 2001
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posted 01-24-2002 04:00 PM
I have ran them and they are plenty noisy! You can't hear it from inside the car but outside it makes people question your engine. And I second the cold morning crankyness. Takes a few minuites for the engine to run right...this was with a fuel injected car too. It would bog pretty bad, but only when realy cold.
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SteveLaRiviere
Administrator Posts: 45869
From: Saco, Maine
Registered: May 99
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posted 01-24-2002 06:09 PM
Well, I'm probably in for a rude surprise when I drop the engine in my Mach with a much quieter exhaust.  The exhaust on the Sprint was very loud. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L DOHC
MCA Member # 47773
My favorite tool is Occam's Razor
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Mpcoluv
Gearhead Posts: 1341
From: Charlotte NC usa
Registered: Apr 2001
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posted 01-24-2002 06:14 PM
quote:
Originally posted by SundanceKid:
I have ran them and they are plenty noisy! You can't hear it from inside the car but outside it makes people question your engine. And I second the cold morning crankyness. Takes a few minuites for the engine to run right...this was with a fuel injected car too. It would bog pretty bad, but only when realy cold.
Are you referring to the rhodes? or the Crane version?
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 01-24-2002 06:33 PM
I have ran the Crane VDLs and was very happy with them when the engine was fresh with about 80 PSI of oil pressure. I gained 2" of vacuum and about 150 rpms @ idle, and I didn't notice any noise at all. But when the Oil pressure went down to about 40 psi after a few 7500 rpm runs, they started getting loud and grumpy on the cold starts. So I guess they like good oil pressure.
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Moneymaker
Administrator Posts: 27499
From: Lyons, IL, USA
Registered: May 99
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posted 01-24-2002 08:07 PM
Well, you all know I'm really a solid lifter kinda guy anyway.  ------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00, '01, & '02
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Part time secret agent license #0089
US Class Nationals link
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SundanceKid
Gearhead Posts: 1274
From: UT
Registered: Feb 2001
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posted 01-24-2002 11:36 PM
Those were the Crane version I was reffering to. My oil pressure was 70 psi never dipped below 40 psi.I have yet to build an engine with solid lifters so I couldn't compair them to solids.
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Rustang
Gearhead Posts: 821
From: Clarion PA
Registered: Nov 2000
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posted 01-25-2002 12:17 AM
I've run the crane's in my pickup's 351W. They do have a little noise to them, but otherwise seem to work fine. One thing I've noticed is when the motor's cold there's an obvious lopey idle. Once it's warmed up the idle smooths out to where you can't tell it from a stock cam. I attribute that to the thick cold oil making the lifters act more like a conventional lifter. I do know of an article in Hot Rod where they compared the rhoades to the crane, and the crane had better idle quality and more torque/power at all rpm.------------------
'68 mustang 351 clevor- 10.92@124
'67 Stang, 351W -11.18@118
'69 351C Torino-14.90@100
'78 Pickup 351W-15.56@88
'79 Pickup 460 ET=??
http://www.rustang-racing.cityslide.com/contents/contents.cfm/712231
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bluestreek
Gearhead Posts: 1724
From: Athens,GA
Registered: Jul 2001
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posted 01-25-2002 12:01 PM
The main reason I like the variable duration lifters is because, even though they are hydraulic, they let you run a bigger flat tappet cam in a street car without loosing a lot of torque down low, and they perform more like a solid lifter in the upper-rpm ranges (6000-7500 rpms).. A cam with more than 224 degrees duration will idle a little rough regardless of the type of lifters you use.
If you want a smooth quiet running engine, you should stick with a cam below 220 degrees @ .050 lift and use standard Hyd. lifters.
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Mpcoluv
Gearhead Posts: 1341
From: Charlotte NC usa
Registered: Apr 2001
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posted 01-25-2002 02:51 PM
I really just want to reduce the body and interior rattle at idle.
I have no drivability problems, just mucho
NVH.
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