4.3 mercruiser question
John Anderson
little more HP I thought going to the 4 barrel carb would be the easiest
upgrade.
Would an automotive manifold work?, the automotive has an EGR valve and
holes where the marine does not.
What type of carb would work best?
Anyone have a blown 4.3 with carb and manifold they would like to part with
?
--
John Anderson
*******************
Ronnie Kowalski
John Anderson <jande...@nc.rr.com> wrote in message
news:wRbb9.32456$iX4.1...@twister.southeast.rr.com...
Tony Thomas
Should work for your engine depending on year. $184.95
As for the carb, you will need a marine 4 barrel carb. (there is a
difference).
Do a search for marine carb on the summit web site. An edlebrock 600 is
$279.95
Good luck,
--
Tony
http://mywebpages.comcast.net/thomastl1
"John Anderson" <jande...@nc.rr.com> wrote in message
news:wRbb9.32456$iX4.1...@twister.southeast.rr.com...
John Anderson
--
John Anderson
*******************
"Ronnie Kowalski" <ronniek...@earthlink.net> wrote in message
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John Anderson
news:y2cb9.274042$2p2.11...@bin4.nnrp.aus1.giganews.com...
> Check out this edelbrock intake EDL-2111 at www.summitracing.com
> Should work for your engine depending on year. $184.95
>
> As for the carb, you will need a marine 4 barrel carb. (there is a
> difference).
> Do a search for marine carb on the summit web site. An edlebrock 600 is
> $279.95
>
> Good luck,
>
> --
> Tony
> http://mywebpages.comcast.net/thomastl1
>
>
design produces 18 more horsepower than the earlier design EDL-2111 on 4.3 L
marine engines"
Do you have any knowledge or experience to help out here?
Doing my math the Mercruiser 2 bl produces 190 HP and the 4bl produces 205
HP, am I correct in assuming that using the Edelbrock manifold and carb that
I could get 15 + 18 or a total increase of 32 HP?
--
John Anderson
*******************
Tony Thomas
question.
By the way, if you are right at max rpms w/ your currenty prop you may have
to go up 1" in pitch.
You don't say what prop you are running but I would highly recommend a good
performance SS prop also.
Will make a world of difference in overall performance over an aluminum one.
--
Tony
http://mywebpages.comcast.net/thomastl1
"John Anderson" <jande...@nc.rr.com> wrote in message
news:XScb9.32475$iX4.1...@twister.southeast.rr.com...
Jim in MA
Regards,
Jim
custom-yac...@att.net
-
"Wally" <el...@ChangeThisPart.com> wrote in message
news:g5lqmusu6n6gekh20...@4ax.com...
> On Wed, 28 Aug 2002 22:08:28 GMT, "John Anderson"
<jande...@nc.rr.com>
> I had a 220 Searay with a 2bbl 4.3. I met up with a guy with the
same
> boat and he had installed a 4bbl on his.
> He said he was very disappointed in the slight increase in power.
>
> I've got twin 4.3's with 4bbl on my current boat. I would expect
the
> bbl don't come into play unless you reall blast it.
>
> Anyone know when the 4bbl are open on a 4.3 - RPM while cruising?'
>
Noname
mph! So... how fast did you want to go???
"John Anderson" <jande...@nc.rr.com> wrote in message
news:wRbb9.32456$iX4.1...@twister.southeast.rr.com...
John Anderson
"Noname" <stv_e...@yahoo.com> wrote in message
news:3d6d6f42$0$73738$4d5e...@reader.city-net.com...
> Consider this.... it take 12-15hp on the average boat to gain 1 mph. Yes 1
> mph! So... how fast did you want to go???
>
faster WITHOUT sacrificing top end. I realize I could put a different pitch
prop on it but I would lose top end. I figure 20-30 HP would probably be
enough.
-JA
John Anderson
http://www.hotboat.net/samplearticle/ENGINETUNINGFORMAXIMUMPERFORMANCE_dir/E
NGINETUNINGFORMAXIMUMPERFORMANCE_s4.htm
Does anyone know if advancing the timing slightly as in this article, will
allow the engine to turn up a few more RPM?
According to the specs for this engine max RPM is 4400-5000. I run a
Stiletto 21 pitch SS prop on the boat and get 4600 rpm. I have also tried a
smaller pitch prop on the boat and still not been able to get more than 4600
rpm, would advancing the timing get me a few more RPM?
-- John Anderson
*******************
"John Anderson" <jande...@nc.rr.com> wrote in message
news:wRbb9.32456$iX4.1...@twister.southeast.rr.com...
Trainfan1
The secondary barrels should not be open on a 4bbl while cruising... that
is the point of a staged carburetor. On an example 4.3 with a Holley
600(which is too big to start with), if it is set up right, the secondaries
might start cracking open around 4000 rpm, but they will probably not open
more than 20-25% by 5000 rpm. By the time you get up to a 5.7 or 5.8 V-8,
the secondary demand from the engine in a recreational marine insatallation
will still only approach about 50%(even with the "small" 600 CFM). For the
4.3, I recommend the Holley 4160 390 CFM Marine carb on a good aluminum dual
plane RV manifold. This setup will give you the hole shot you are looking
for with improved airflow velocity(translates to low-end torque and cruise
economy) while still having the secodaries available above 3500 rpm for what
will amount to a slight gain in top end.
Most boaters will notice the biggest performance differences with propellor
changes.
Rob
*
*
*
"Wally" <el...@ChangeThisPart.com> wrote in message
news:g5lqmusu6n6gekh20...@4ax.com...
> On Wed, 28 Aug 2002 22:08:28 GMT, "John Anderson" <jande...@nc.rr.com>
> wrote:
>
> I had a 220 Searay with a 2bbl 4.3. I met up with a guy with the same
> boat and he had installed a 4bbl on his.
> He said he was very disappointed in the slight increase in power.
>
> I've got twin 4.3's with 4bbl on my current boat. I would expect the
> bbl don't come into play unless you reall blast it.
>
> Anyone know when the 4bbl are open on a 4.3 - RPM while cruising?'
>
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"John Anderson" <jande...@nc.rr.com> wrote in message
news:wRbb9.32456$iX4.1...@twister.southeast.rr.com...
Trainfan1
secondaries opening while cruising.
The secondary barrels should not be open on a 4bbl while cruising... that
is the point of a staged carburetor. On an example 4.3, if it is set up
right, the secondaries
might start cracking open around 4000 rpm, but they will probably not open
more than 20-25% by 5000 rpm.
Rob
*
*
*
"Wally" <wil...@burnam.com> wrote in message
news:ehismu4o7ceb6t4pc...@4ax.com...
> Thanks for taking the time to explain this. Maybe you are mixing me up
> with the thread originator. I already have 4.3's with 4bbl.
>
> I am still wondering when the secondaries open up. I jknow they do if I
> floor it, but I was wondering at what RPM if cruising.
> The max RPM for my engines is 4500-4600.
Tony Thomas
increase. If they do not, then there is something wrong w/ your ignition
system.
Start w/ plugs and distributor cap and rotor and a good set of plug wires
(like taylor 8 mm).
I have actually seen the distributor rotor assembly cracked and allowing the
timing to fluctuate.
--
Tony
http://mywebpages.comcast.net/thomastl1
"John Anderson" <jande...@nc.rr.com> wrote in message
news:_0pb9.36239$iX4.1...@twister.southeast.rr.com...
Noname
300-400 rpm which would keep your top speed the same. And... the lower pitch
will get you going faster out of the hole.
"John Anderson" <jande...@nc.rr.com> wrote in message
news:_0pb9.36239$iX4.1...@twister.southeast.rr.com...
DanF
>On Wed, 28 Aug 2002 22:08:28 GMT, "John Anderson" <jande...@nc.rr.com>
>wrote:
>
>I had a 220 Searay with a 2bbl 4.3. I met up with a guy with the same
>boat and he had installed a 4bbl on his.
>He said he was very disappointed in the slight increase in power.
>
>I've got twin 4.3's with 4bbl on my current boat. I would expect the
>bbl don't come into play unless you reall blast it.
>
>Anyone know when the 4bbl are open on a 4.3 - RPM while cruising?'
>
I don't think you'd even know you had 4 bbls until 3500-4000+ rpms.
Are yours vac secondaries or mechanical? I would tend to agree w/guy
you met...disappointing in usable range.
Danny
DanF
>On Thu, 29 Aug 2002 15:16:25 -0400, "Trainfan1"
><LMSE...@usadatanet.net> wrote:
>
>>No confusion. I was just trying to answer you question about the
>>secondaries opening while cruising.
>>
>>The secondary barrels should not be open on a 4bbl while cruising... that
>>is the point of a staged carburetor. On an example 4.3, if it is set up
>>right, the secondaries
>>might start cracking open around 4000 rpm, but they will probably not open
>>more than 20-25% by 5000 rpm.
>>
>>Rob
>
>Thanks for the extra info.
>
>Just to get this straight, if I slam the throttles down and wait until
>I'm at 4500 RPM, the secondarys are only open 25%.
No. They will be wide open then. The secondaries will only open in the
top 15-20% of your rpm range.
>Okay... why is that? Why aren't they all the way open? I'm pushing the
>throttle (pedal) to the metal, doesn't that open the butterflies all the
>way?
Danny