Re: RE: Re: Hughes Engines Cam selection - Attn. John

From: Mark Kuzia (flyboy01@worldnet.att.net)
Date: Sat Nov 27 1999 - 01:13:35 EST


Hey Frank,
When you said "one step above the "RT" cam" , did you mean the Mopar R/T
engine package cam?

Mark Kuzia
95 Dak 5.9L, 5-spd, 4.10-SG
13.790 @ 99.42 mph (2.091 60 ft)
99 Dak 5.2L, 5-spd, 3.92-SG
14.896 @ 91.08 mph (2.072 60 ft)
flyboy01@worldnet.att.net
http://home.att.net/~flyboy01/360Dakota.html
----- Original Message -----
From: Frank T Holloway <Frank.T.Holloway@KP.ORG>
To: dakota-truck <dakota-truck@buffnet.net>
Sent: Friday, November 26, 1999 11:43 AM
Subject: DML: RE: Re: Hughes Engines Cam selection - Attn. John

| John,
|
| Cam Selection should be based on what you are trying to do and the
components that you are going to replace. On the Magnum engines, there are a
couple of things that we need to work within. The heads (both stock and
ported), tend to like a little more duration on the exhaust. Because of
this, split duration cams seem to make more power. The computers can be
modified to work with duration figures up to approx. 225 degrees duration.
The key is to have idle vacuum of 10 inches or more and the lobe separation
angle should ideally be 114 degrees but you can get by with 112 degrees. The
heads (with stock valves) tend to flow all the way up to .600 lift so the
more lift the better. With 1.7/1 rockers, you can build the lift faster and
add additional lift if needed so the 1.7's are a good bet. If larger intake
valves are installed and the intake ports modified correctly, then you will
see a reversion in flow at about .550 lift but don't worry about this
because of flow figures while y!
| !
| ou are opening the valve. In regards to emissions, duration figures above
220 degrees @ .050, the engines tend to get dirty and will not pass
emissions tests (keep this in mind). With high lift cams, make sure you
upgrade the valve train components to match the cam (stiffer springs, better
rockers and especially the rocker hold-down bolts). Match the cam to the
intake manifold you are going to run. It doesn't make sense to select a cam
that has a powerband of say 2,500 - 6,000 RPM if you are using the stock
intake. The stock intake flows best from 1,500 - 4,000. Match the powerband
of the cam to the weight of the truck, the gearing and the torque converter.
Sort of a long way around answering your question. If you want my opinion on
a cam for your truck, take a look at this custom grind out of Crane (P/N
70HR00003). Give Crane a call and they will fax you the Cam Spec. Card. The
figures are 208, 214 degrees duration at .050, lift figures int. .467, exh.
.520 inch. Lobe Separa!
| !
| tion Angle is 114 degrees and the powerband of this cam is 2,000 - 5,500
RPM. This cam is one step above the "RT" cam and will work fine with just
about anything you want to do. All of Crane's cams are based on new cam
cores (not re-grinds) and can be ordered through places like Summet and Jegs
for around $220.00. If you can tolerate slightly more duration and lift,
switch to the 1.7/1 rockers and you will have lift figures of .496 - int.,
.552 - exh., with a couple of degrees more duration at .050 inch. If you
really want to get crazy, check out Crane P/N 70HR00004.
|
| Frank
| ---------------------- Forwarded by Frank T Holloway/CA/KAIPERM on
11/26/99 07:57 AM ---------------------------
|
|
| jmautz@home.com on 11/25/99 09:34:00 PM
| To: dakota-truck@buffnet.net@Internet
| cc: (bcc: Frank T Holloway/CA/KAIPERM)
| Subject: DML: RE: Re: Hughes Engines Cam selection - Frank
|
| Frank,
|
| Thanks for the suggestion.
|
| The next step in the Hughes line would be the HER1218AL. The main
difference
| is the exhaust lift is .527 and the duration is longer (in/out = 215/220 @
| .050 tap. lift). The rest is about the same. Does this sound like a
better
| cam for my situation?? I know that loss of low end torque will really
kill
| me because of the weight of my 4x4 Durango.
|
| They say that they'll do custom grinds, so would the best of both cams be
to
| use the HER0612AL as the base (duration) then add the .527 on the exhaust
| and the 114 LSA?
|
| Thanks for you help!
| John
|
| P.S. I will be adding a set of ported heads when I do the cam install.
| >----- Original Message -----
| >From: John Mautz <jmautz@home.com>
| >To: <dakota-truck@buffnet.net>
| >Sent: Tuesday, November 23, 1999 9:25 PM
| >Subject: DML: Hughes Engines Cam selection
| >
| >
| >> Hi all in DML land!
| >>
| >> I know at least one of you has installed a Hughes Cam but I don't
| remember
| >> which one and I would like to know how which one you went with and how
| the
| >> install went.
| >>
| >> I'm thinking of their HER0612AL Magnum Roller Cam for my '99 5.9L
| Durango.
| >>
| >> Here are the cam specs:
| >>
| >> Lift @ 1.6 ratio: in/ex .512"/.512"
| >> Dur @ .2": in/ex = 126/131
| >> Dur @ .05": in/ex = 208/214
| >> Ad Dur @ .02": in/ex = 258/260
| >> LSA: 112
| >> Open @ .05" tappet lift: in/ex = 12 ATC/36 BBC
| >> Close @ .05" tappet lift: in/ex = 40 ABC/2 BTC
| >>
| >> They make hotter cams but if the magnum roller cam fits their other
| >> descriptions this would most likely be my best choice, but if
| >you picked a
| >> different one I would like to what your reasons were (I could be wrong
in
| >my
| >> thinking).
| >>
| >> Hughes Engines web site is http://hughesengines.com.
| >>
| >> Thanks,
| >> John.
| >>
| >
| >
| >
| >
|
|
|



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