I can back up Bernd's claim on the stock short block, but it's gonna take
some Boost and a mild Nitrous shot to get there..........
I've dyno'd at 290 hp and 384 tq on the Stock Long Block with the original
Head Gaskets, running way Rich as well....
Bernd..... you still running the 206V6B Cam you were running on the first
built up V6?
Ron
01' Dakota RC 3.9 4X4, Street and Show
02' Dakota RC 3.9 4X2, Future Project
From: "Bernd D. Ratsch" <bernd@dodgetrucks.org>
Reply-To: dakota-truck@dakota-truck.net
To: dakota-truck@dakota-truck.net
Subject: Re: DML: 3.9L cylinder head work
Date: Sun, 01 Apr 2007 18:28:17 -0500
You can produce plenty of power with the stock camshaft - heck, I made
288RWHP and 381RWTQ with the stock block and PCM (Supercharger and a mild
50HP itrous intercooling). Right now, i'm making my best power at
3000-5500rpm (cam/heads/intake/exhaust combination)...but that's with a lot
of mods - 221RWHP last time we dyno'd it - still need to retune it though
for the MS109 fuel I use.
I drive mine daily as well - even with all the mods I've done over the
years. Nothing "radical" as I didn't want something just for the
weekend...and she gets 17-20mpg to boot. :)
The cam specs they list are using a max of a 1.6:1 rocker. With the 1.7:1,
you'll definitely need to change the valvesprings to handle the .540"-.560"
lift. That's a lot of lift for a V6..make sure you have them check the
valve to piston clearance. BTW: It's a bit confusing...they show it for a
V6 but the description is for a V8 (5.2L). My cam is close to that but with
a little more overlap due to the 10.75:1 compression i'm running...still
streetable though.
On the engine buildup, you're on the right track. Mild cleanup work on the
heads, 1.7:1 rollers, headers, intake manifold runners cleaned up and
smoothed, 180 t'stat, 50mm TB, and a decent exhaust...you'll be more than
happy with the results. If you can...bump up the compression to 9.5:1 with
some KB Silvolites ($150 for the set) and you can still run mid-grade (Super
preferred though).
- Bernd
msnbcnnbcbs@hotmail.com wrote:
>Hi Bernd,
>
>I keep getting into an argument with the friend of mine, hes telling me I
>cannot produce any power with the stock camshaft. He is telling me I need
>to
>rev the engine to 6k (or more) to get any decent power out of it.
>
>My issue is if the cam needs to come out, things start getting
>prohibitively
>expensive. between a new cam, a valvetrain that can handle 55000+ rpms, and
>the
>custom tune, along with all the items i described below, i may be looking
>at
>close to $5,000. My budget was around $3,000. He is telling my upgrades are
>a
>waste of time without a cam swap. Besides, this truck is a daily driver and
>I
>didnt want to do anything too radical.
>
>My idea was to put as much power out using the stock cam as I could. I've
>seen
>stock V6 heads, and they dont look to good. I happen to be near a shop here
>in
>south florida (mesa balancing) that has done some head work for 3.9's in
>the
>past. I was hoping to get a 2nd set of heads, have them worked on, get the
>1.7
>rockers on, a new set of headers, the superchips tuner (3715, ive used it
>before and I got some good butt-dyno feelings from it), new injectors, and
>possibly have the intake manifold worked on.
>
>heres the link again:
>
>http://www.hughesengines.com/partDetail.asp?partID=10697&eTypeID=10
>
>if that doesnt work, the part number is HER0814AL-V6. Someone on the list
>reccomended this cam. He used it on his V6 build-up, cant remember who it
>was
>though....
>
>
>
>
>
>
>
>
>
>In article <46102144.1080205@dodgetrucks.org>, bernd@dodgetrucks.org
>("Bernd D.
>Ratsch") writes:
>
>>I don't have any hard numbers from a before and after, but I have
>>extensive head work on my 3.9L and it made a world of difference with the
>>cam selection. For the stock cam though, there is no need for polishing
>>work unless you plan on running either a supercharger or alcohol/nitro.
>>You actually want some "tumbling" in the intake portion. On the exhaust
>>side...go ahead and polish them if you want. Best place to actually
>>polish the heads is in the combustion chamber - it control detonation
>>(removes hot spots from high/low casting flash spots).
>>
>>The 1.7's will work really well with the stock cam but don't plan on
>>revving the engine past 4800rpm - the stock cam falls flat at about
>>4600rpm...even with the 1.7's.
>>
>>The stock PCM will be able to compensate for mild cam/head changes...to a
>>point. Don't go overboard though with the cam/head porting work though -
>>you will need to put it on a dyno to get the PCM tuning done right. These
>>generic "custom flashes" are more of a headache than they're worth - yes,
>>I deal with those as well at the dealership...nothing but problems until
>>we get them on a Dyno and use either an AEM or ROE controller to fix their
>>screwups.
>>
>>I tried to look at the cam link you wrote...but it isn't coming up for me.
>>
>>- Bernd
>>
>>
>>
>>msnbcnnbcbs@hotmail.com wrote:
>>
>>>anyone have any numbers on the gains for a port/polish on the heads on a
>>>
>3.9L,
>
>>>with a stock redline?
>>>
>>>I'm asking because Im getting my parts list together and would like to
>>>
>avoid
>
>>>yanking the cam out and having to have the computer reprogrammed. Or can
>>>
>the
>
>>>computer adjust so long as the cam profile isnt too radical? Im trying to
>>>
>avoid
>
>>>downtim as the truck is a daily driver and I need to give it some ballz
>>>so
>>>
>I
>
>>>can race it at the track without running 17's and looking stupid :)
>>>
>>>fyi, its something like this:
>>>
>>>2nd new/rebuilt set of heads with port/polish (gonna grab em from ebay
>>>and
>>>
>have
>
>>>them taken to a shop near me that does headwork)
>>>
>>>1.7 Rockers (the harland set from summitracing)
>>>
>>>new set of "long-tube" headers (stock ones will most like not come
>>>
>off/break)
>
>>>new 19lb/hr injectors (have them, need to install them)
>>>
>>>new doubler-roller timing chain (have, need to install)
>>>
>>>superchips tuner 3715 (used to have this, its in the mail)
>>>
>>>not touching the cam because of computer issues (unless it can adjust)
>>>specifically, this one
>>>http://www.hughesengines.com/partDetail.asp?partID=10697&eTypeID=10, as I
>>>
>cant
>
>>>afford the downtime.
>>>
>>>
>>>
>>>thanks.
>>>
>>>
>>>
>>>
>>
>
>
>
>
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