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Formula/Thunderbird
 BoatUS Boat Groups/Manufacturer Forums>>Formula/Thunderbird
Subject Topic: 34pc engines Post ReplyPost New Topic
 
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john boho
"Seaman Recruit"




Joined: June 12 2006
Posts: 3
Posted: June 12 2006 at 00:00 | IP Logged Quote john boho

im in the process of looking at a 34pc it has the 6.2 mpi's in it

is this enough power for the 34 or should i look into the larger engine version if you have any experience with this please help

thanx  jb 

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Molson Golden
"Seaman Recruit"




Joined: May 26 2006
Posts: 1
Posted: June 12 2006 at 00:00 | IP Logged Quote Molson Golden

John,

It all depends on what you are trying to accomplish, for every option there is always a trade-off.  The 6.2s will probably cost you less to purchase & will give you better fuel economy than the Big Block options.  

I have a 34pc with the Volvo 8.1s and their duo-prop out drives.  So far I am not totally impressed with the top end performance, but I traded up from a much lighter 29 boat with twin 350 mags.  I would guess that my top end at close to 5,000rpms is around or a little over 40mph.  This comes at a cost  I am probably getting .75 miles per gallon when I run WOT.

Now with the 6.2s your top end is going to take a hit, but your wallet will probably take less of one at the pump.  You need to ask yourself; what do I really want to do with this boat?  If you want to zoom around at 40+mph this is probably not the boat for you.  If you want to cruise around at about 20mph getting decent MPG in a comfortable high quality boat you may want to pursue it.

Hope this helps.

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john boho
"Seaman Recruit"




Joined: June 12 2006
Posts: 3
Posted: June 14 2006 at 00:00 | IP Logged Quote john boho

great response i will consider the trade off

my biggest worry is resale in future it seems a lot of 34pc's were sold with the big blocks  thanx  jb

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lbi4fun
"Seaman Recruit"




Joined: June 03 2005
Posts: 24
Posted: June 14 2006 at 00:00 | IP Logged Quote lbi4fun

I have the 6.2 on my 31PC and it works very well with it. However, from reading and research it seems that the big block will give very close MPG at cruise if not better because it does not work as hard. For the 34PC, I would think you need the big block and the 6.2 might be a bit underpowered. Compare the weight and specs between the 31 and 34 and you will see what I mean, I normally cruise at 3000RPM/27MPH and with a full load of 8 to 11 people.

 

Good luck.



Edited by lbi4fun on 14 June 2006 at 7:11am


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LBI4fun, 2005 Formula 31PC T-Merc 6.2MX 320HP
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john boho
"Seaman Recruit"




Joined: June 12 2006
Posts: 3
Posted: June 15 2006 at 00:00 | IP Logged Quote john boho

thru my findings i noticed they dont offer the 6.2 engine they offer the 496   in the merc sterndrive  they were selling a lot more big blocks with this boat the  34pc  i would like to have specs on the  2 engines  6.2 and the 496  to see mph,  gph , and  range difference on the 2  i bet the range difference is substancial  

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lbi4fun
"Seaman Recruit"




Joined: June 03 2005
Posts: 24
Posted: June 15 2006 at 00:00 | IP Logged Quote lbi4fun

Below are Boattest.com results for 34PC, .98MPG is very impressive compared to a my 31PC with 1.1MPG with 6.2MX. I think you might get better range with the 496, you might burn more in hole shot but I think you'll make it at cruise.

 

Test Power: 2 x 375-hp MerCruiser 496 MAG
RPM MPH Knots Total GPH MPG NMPG Range NM Range dBa
650 3.7 3.2 2.7 1.38 1.2 256 223 68
1000 6.2 5.4 4.4 1.41 1.22 261 227 71
1500 8.9 7.7 6.8 1.31 1.14 243 211 74
2000 10.8 9.4 12 .9 .78 167 145 76
2500 16.3 14.1 17.2 .94 .82 175 152 77
3000 23.4 20.3 23.7 .98 .86 183 159 81
3500 30.5 26.5 32.1 .95 .83 176 153 82
4000 33.7 29.3 47 .72 .62 133 115 89
4500 44.8 38.9 55 .81 .71 151 131 91
5000 46.3 40.3 61.7 .75 .65 139 121 93



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LBI4fun, 2005 Formula 31PC T-Merc 6.2MX 320HP
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BryanK
"Seaman Recruit"




Joined: June 29 2004
Posts: 7
Posted: August 21 2006 at 23:48 | IP Logged Quote BryanK

I have the 496s and really think they offer the best trade-off of fuel economy and performance.  I have hit a top-end of 49.8 MPH with the boat, though it certainly moved the fuel gauge.  Overall, I cruise at 3400 RPM at about 24.5 MPH.  Also, I have not yet had a problem with these engines in 3 years of service.

However, I agree with the post that mentions you need to decide what you want the boat to do.  Top-end speed is not very important to me, but resale value and just knowing that I could hit a higher top-end if I needed to are.



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BryanK
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2004 Formula 34 PC
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