bertram31.com

Michael

JR,
Sorry but I wouldn't touch those GM 8.2 diesels with a barge pole.

Michael

I likewise am a fan of the B25. Have had one since 1970 and was my introduction to Bertrams and in lead to me getting a 20 and more recently a 31. I still have all 3.
One thing I liked about the B25 were the fiberglass stringers - no wood to rot.

Michael

I likewise ana fan of the B25. Have had one since 1970 and was my introduction to Bertrams and in lead to me getting a 20 and more recently a 31. I still have all 3.
One thing I liked about the B25 were the fiberglass stringers - no wood to rot.

Michael

I am thinking about replacing my original Cummins gauge panels, either with better Cummins panels or individual gauges. So what would you guys recommend? Do any of you have decent Cummins panels that you are not using and would like to sell? If you were to replace the gauges, what brand would you us...

Michael

It amazes me what some people in this sandbox will do for people they do not know and haven't even met. Even though this sort of thing has happened before, I feel each story needs to be told. As I am sure you are aware, Gert over in the Netherlands has recently removed the rearbulk head windows to g...

Michael

Tommy,
I haven't splashed it yet with the straight 6. But from Bertram advertising it was supposed to do about 39-40mph at WOT - I am sure testing done under ideal conditions. I would say realisitically WOT would be more like 36mph.
So my guess at cruise would be around 28mph

Michael

Ian, the Sportsman being redone on the B25 site has had the storage boxes modified already as I beleive the engine that was in there before was a V6.

Michael

Tommy, I have a B20 Sportsman. Was repowered several years ago with a small block V8, which is a tight fit. Boat is very stern heavy with this power package and I feel it does not perform well as the driving position is very far aft. Carried 20 gal of water in bow to help balance the boat. Think the...

Michael

I get a little higher top end, clean botom I can get 29knotsand change at 2750rpm.
Ditto on cruise at 24knots

Michael

Pictures of my gauges, hope this helps

http://s1225.photobucket.com/albums/ee3 ... %20gauges/

Michael

Bruce, so does that mean my tach/hourmeters could be toast?
Thanks

Michael

Have a question regarding the tach/hourmeter gauge. Engines have the Cummins gauge panel with the older VDO gauges with square bezels. Tachs have built in hour meters, and neither of the hour meters are working. Tach part works. Find it strange that both would be broken at what appears to be about t...

Michael

Spencer, It is just that it seems there are several B25's out there with half your horsepower doing about the same speed as you. Granted they may be lighter, but do not think that the weight difference would kill off that much speed. My B25 is powered with a single sterndrive, 320hp, and I an kissin...

Michael

Spencer,
I am surprised that your top speed is only 37knots. With 450 ponies back there I would have expected more like 45knots. Were the engines running correctly and propped correctly? Perhaps weight was an issue with those 2 big engines hanging off a bracket?

Michael

What Walter said

Michael

Agree with other posts. Start with battery and see if it will take a load. Check cables and connections. If all good then starter probably needs to be pulled and rebuilt

Michael

Thanks guys, will check it out

Michael

Thanks guys, I am on it.
One other question for now - where should I find the model/serial numbers on these engines? Note I have not even tried looking for this yet.
Thanks

Michael

Guys, As a mentioned recently I just bought a B31 with these engines. Unfortunately boat did not come with owner or parts manuals. Any chance one of you has them and would be able to scan/email them to me? Thanks for any help. (I am not having any issues with them, but want to learn a bit about them...

Michael

I have had 15 adults in my B25, didn't even feel it. If anthing the boat rode better with the extra weight. Boat planed off as normal and achieved very close to normal speed/rpm base lines.
I would think 16 in a B31 would be no problem at all.b

Michael

Thanks UV

Michael

As I am not at boat right now, does anyone know the alternator output of the standard alternators on Cummins 250hp?
Thanks

Michael

Peter, I would agree. If starter motor was bad you should still get a voltage reading on your gauge. Surprised you still get a click though if no voltage? Do you have neutral start only safetly switches? If so maybe not quite in neutral? Do none of your gauges move when the key is turn on? If not I ...

Michael

Ian,
Yes I slapped some paint on her while the engine was out. Started out just doing the blue on the sides which lead to doing the decks and cockpit....

Michael

Buju, Yes, Loose Cannon used to have a 320hp PCM engine and volvo duoprop. Would get up to 56knots plus. Prety quick but a handful as not much boat in the water. Ian, Yes my bro's boat used to have a V6 in it which was way heavier than the D3, so the water line is too high. He plans to remove the bo...

Michael

Thought I would show you pictures of the B20 Sportman center console. Sorry the pictures are not great but currently it is work in progress. The first 4 pictures of the navy blue one are mine. And to show you Bertrams run in the family, the white one is my brothers and has a D3 for power. http://s12...

Michael

Rocket, Yes the baby blue B25 hardtop is mine and has been converted to a single engine which is a SBC with fuel injection. 320hp married to a volvo duoprop. WOT with clean bottom is between 39.5 and 40 knots. A 3000rpm cruise speed is about 27knots. No idea on fuel burn but I am happy with it. Only...

Michael

Hope this works. Few pictures showing non Bertram bridge plus spots where helm would have been on open model as hull number would indicate. Can anybody shed any light on hull number and hull configuration? To me it sure looks like it did not originally come as a open model, but I could be wrong http...

Michael

Test of posting pictures. If it works, it will be of my B25 as Thise are the only pictures I have at work.
http://s1225.photobucket.com/albums/ee3 ... C00972.jpg

Michael

I haven't even taken any pictures of the new to me B31. As I have yet to sign up for photoshop/other host site, I can't post pictures here. If some one wants to do it for me, shoot me any email address and I will take some pictures and email them to you to post. My email addresses are: boataddict AT...

Michael

Thanks for the welcome. Can't post pics as I have not signed up for any hosting site such as photobucket - gotta do that when I get a chance. Yes, I know JJ and yes he still has a B31. This one was just his interim one until he rebuilt the one he has now. He also has a B25 hardtop like mine. My B31 ...

Michael

Hello all. Have been signed up here for some time now, but really have only been a lurker as I did not own a B31. Well that has changed as I just got one last week. Power is twin 250hp Cummins and used to belong to fellow member on here who goes by "Bermuda brother" (JJ). So yes I am in Bermuda also...

Michael

Liguor box.

On a whaler on davits off back of boat, Hang Over

Inner piece

Michael

Cunning Stunt

Michael

Gotta agree with capt Patrick on this on - no governor on those gas engines. You risk blowing them up if you go to WOT in neutral

Michael

You checked compression? Water in cylinder(s)?
Try adjusting low speed fuel mixture?

Michael

If they are the volvo 40 series, they were not the best, in fact they may be the worst engines produced by volvo. They were prone to water leaks and overheating. Also the mechanial shift gears were not great, the later hydraulic ones better. Weren't worth much more than gassers. The 41 series were m...

Michael

Ian,
At that price I would buy it sight unseen. Great boats, I know as I have one. If no one else buys it, I just might

Michael

Yes, that is a factory hardtop. I had one just like it, came from new that way. Don't think many were made asI think ihave only seen one other.

Michael

Bruce,
As per Walter, I would like ot hear about your thoughts on a B20 application of these motors. Have asked in two previous emails, but no reply to date

Michael

Bruce,
I have been interested in these engines for a while, but not keen on the Merc sterndrive. Can this engine be easily mated to a Vovlo drive?

Michael

8 I think.

2 Bertrams (had 3, just sold 1)
2 Boston Whalers
1 Glasspar G3
1 Allison race boat
1 Whirlwind runabout
1 Bristol race boat (English made)

bertram31.com

Search found 92 matches

Cummins 250hp gauges

Most on this board are a cut above, Gert is one of them

Cummins 250hp

Cummins 250hp

Cummins alternators

B20 Sportsman

My B31, pictures

New B31 owner

Bertram 20 Sportsman