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Do i need the heavy flywheel on 57

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budvoss

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swapping out a 4.3 to 5.7. whe

swapping out a 4.3 to 5.7. where I'm going to the V8 do i really need the heavy fly wheel or can i use a flex plate. this is on a 18 ft boat v Hull
thanks
 
You have two flywheels availab

You have two flywheels available for your application: 12.5" and 14". Which one you should use depends on which starter and bellhousing you have.
 
"Two questions are in need of

"Two questions are in need of asking/answering on this one.

** Is this for an AQ series Volvo Penta? If yes, you must use the 153 tooth flywheel. The large flywheel will not fit inside of an AQ series Flywheel Cover.
** Secondly, your marine engine requires the entertia of a flywheel.......
In addition, there must be something for the Volvo Penta B/W spline "drive coupler" to fasten to. If not, there will be nothing to put power to the Primary Drive shaft.


If this is to be an '87 or later 5.7L engine, there is a 153 tooth flywheel from an automotive application that will work.

."
 
"thanks guys. this a one piece

"thanks guys. this a one piece seal 1995 Chevy 350 that i am installing. I was wondering where i would find a heavy flywheel. I was thinking that maybe a 153 tooth stick car wheel would work but no one has one around here.
The wheel that came off the 4.3 is 14 inch. It bolts up fine to the V8 but i think the balance of it is wrong for the V8

Ricardo ,would you know a part # for the wheel you mentioned
thanks again guys"
 
"Butch, the fact that you are

"Butch, the fact that you are needing a flywheel and the fact that you mention a torque converter flex plate/ring gear, may infer that you are attempting to use an automotive 5.7L engine in a marine application. (I hope that I am wrong on that)

If this boat is much larger than 21 feet or so, IMO this is not a good candidate for an engine.
Add to that if by chance this is to be raw water cooled, you now have future head gasket corrosion issues, let alone the issues of dished pistons and the automotive camshaft profile for a marine application.

Regarding the flywheel that works for the later crankshaft in the AQ series flywheel cover (bell housing in the auto world);
The one that works would be one from a 1987 and later Camero w/ a standard transmission. Most of these Cameros seemed to use the smaller 153 tooth flywheel.
(seems that there were a few Firebirds that also used the 5.0L and 5.7L SBC engines.... this will may work also)

Some time back, Roger (of MichiganMotors) and I discussed the part number for this. He needed a p/n for the 153 tooth wheel due to the amount of requests for later year model engine replacements in the AQ series V/P boats.
I may have this p/n around here somewhere.
If you run into a wall on this....., contact Roger, or get back to me.

Also, if your area has any ERS (engine rebuilder supply) companies, they may be able to help you.
You don't need a good friction surface on this, so a used f/w that is a little scuffed up will do just fine.

I would definitely install a new ring gear!
Make sure that the person installing it does not allow it to become "Red" hot in any areas. (just my personal take on that!)

."
 
"what i have is new rebuilt bl

"what i have is new rebuilt block, brass, plugs , marine gaskets, marine cam and compression should be at 9-1. boat is 18 ft.

Yes i was thinking of using the automatic flex plate as it IMHO really don't do a thing but start the motor and wont need the tq on this small boat. the out drive coupling bolts threw the flexplate and into the crank.I'm thinking no stress on flexplate except at starting.

where its a smaller boat i was wondering if it really needs the heavy one.
thanks"
 
"If that is your main concern

"If that is your main concern and question..... my answer (as gently as I can put it), is still YES!
Furthermore..... it provides much more than a gear for the starter motor!
These engines need the mass and enertia of a true flywheel! No questions about it.
Can you imagine trying to get your idle rpm set correctly without a flywheel?

I'd recommend that we don't try to re-engineer. Volvo Pents's engineers designed this to have a flywheel in place.
If one was un-necessary, the likes of Marine Power, Crusader, M/C, OMC, Volvo and many more..... would have all been eliminating it from their systems."
 
"Butch, you may be interested

"Butch, you may be interested in knowing that a flywheel does much, much more that allowing the starter to turn the engine. In fact, flywheels were applied to reciprocating engines long time before starters were invented!!!

In a few words, they are inertia energy storing devices. Too light of a flywheel will give you an engine with fluctuating RPM that will run unevenly and can eventually lead to crankshaft failure.

I hope you will find this link interesting. You can conduct further research in Google if you are interested

http://en.wikipedia.org/wiki/Flywheel"
 
"ok ok i need the heavy flywhe

"ok ok i need the heavy flywheel.
thanks all
happy.gif
"
 
all ican find for flywheels ar

all ican find for flywheels are 168 tooth for the one piece rear main. the v6 i have is also a 168 tooth. i counted them twice and its 14 1/8 Dia.. the 153 tooth seems to be for a two piece rear main on the v8
thanks
 
"Butch..... I've been a ma

"Butch..... I've been a machanic since the mid 1960's. Been involved with the SBC since.
When I say that these IS a 153 tooth wheel for the one piece main seal engines, I'm saying tat there is a 153 tooth wheel.
Follow my lead, and you'll find one!
Also check a few online Hot Rod forums, or a Camero specific forum.
Use Google.

."
 
"OK I'm looking for a new

"OK I'm looking for a new style with the different bolt pattern. My intown napa says no way for a 153 to fit a new style crank 88 up. I can find one for the old style crank bolt pattern. not trying to start a war, just telling you what they tell me. they say i need the 168 tooth to fit my new style crank that is in my one piece seal block. my local parts store I'm dealing with not after market race flywheels
thanks"
 
"I can find them after market.

"I can find them after market..and thanks for the help.I guess I'm confused as to why i need the 153 tooth wheel. Wont the 168 tooth fit the housing . The housing came off a 1997 4.3 and it has a 14 inch 168 tooth wheel. If the 14 inch fits the v6 than why wont the 70 buck napa one, the 168 tooth fit. its also 14 inch but made for the 1995 350 crank.

I don't know what AQ series means but my boat is a 1997 with the cobra out drive by Volvo penta.
thanks again guys"
 
"OK, now that we finally have

"OK, now that we finally have ALL of your information, we can better help you.
Also, you do not need a "heavy" flywheel.... you need a flywheel! (a ring gear/flex plate is NOT a flywheel! When combined with a torque converter, it does what a flywheel can do..... and this is it offers mass/enertia!)

The NAPA store is simply mistaken.... the 153 tooth flywheel does exist. There are people installing the later engines in the AQ series drive boats often. MichiganMotors sells these for this application all of the time. It is becoming very common to see this.

As for drive type; You likely DO NOT have an AQ series drive. You more than likely have the later Gimbal style SX drive or DP S drive.
That suggestion was included in my first post!
Quote; "** Is this for an AQ series Volvo Penta? If yes, you must use the 153 tooth flywheel. <u>The large flywheel will not fit inside of an AQ series Flywheel Cover."</u> un-quote

Now I can tell you that the larger flywheel may work. Check this against your 4.3L flywheel diameter and/or tooth count!
That will give you your answer!

Sorry for any confusion, but it was there from the get-go.

."
 
"Im sorry about the confusion,

"Im sorry about the confusion, as i caused all of it. i just dont know how to express myself properly . thanks again for all the help"
 
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