Home |
Search |
Today's Posts |
#41
posted to rec.boats
|
|||
|
|||
E-Tec problems?????
Butch Davis wrote: Matt, Very little fuel use data for E-TECs? Take a look at e-tecinfonet.org for some performance vs consumption numbers on several different boat/motor combinations. Yep, I checked that out Some of it seems to be from preproduction units ... Thus data should be seen with caution... I wouldnt wtite the motors off because of that. Compared to Yamaha its little data but probably more than what there is for Merc Agree that owner data can be inaccurate unless a fuel flow meter and GPS is used. Yes totally .. if one measured with a normal boat speed sensor and mechanical flowmeter the results can easily out 10-30% Matt |
#42
posted to rec.boats
|
|||
|
|||
E-Tec problems?????
Why does it seem to be from pre-production units?
Butch "M" wrote in message oups.com... Butch Davis wrote: Matt, Very little fuel use data for E-TECs? Take a look at e-tecinfonet.org for some performance vs consumption numbers on several different boat/motor combinations. Yep, I checked that out Some of it seems to be from preproduction units ... Thus data should be seen with caution... I wouldnt wtite the motors off because of that. Compared to Yamaha its little data but probably more than what there is for Merc Agree that owner data can be inaccurate unless a fuel flow meter and GPS is used. Yes totally .. if one measured with a normal boat speed sensor and mechanical flowmeter the results can easily out 10-30% Matt |
#43
posted to rec.boats
|
|||
|
|||
E-Tec problems?????
M wrote:
I am on neither side here but happen to own a 2.5l Optimax and was interested in getting a 150 HP ETec. apologies I accept that might have seemed like I was trying to verbal you & it was not intended. No worries we are cool. I didnt take it that way at all. Since those engines arent cheap, I am VERY interested about knowing about ANY problem that MAY be there. The fuel use of the ETec seems to be 5-15% higher as an optimax/4 stroke which is to me a concern. But for others with deep pockets it may not. I think the fuel claims are well out of order when posted by dealers of outright spruikers & as you say independent tests say otherwise. I hold in their favour that you can tweak fuel use a little depending what boat and what prop you use ... The problem is that there is very little ETec fuel use data and none looks in favour of ETec. In favour of ETec we have to hold that its meant to be a powerful motor, not so much a fuel miser. But since BRP advertises it as being economic they will have to hold up to our scrutiny But it's not either Matt, have a look at the B&WE dyno tests the 250 only makes 239 which is legal BUT then they claim it doesn't use much fuel!!! If you account for the lack of power (239 vs say a real 250 for the others) then it's fuel use is terrible!!!. Tom's fuel claims are not even laughable, but runaway william's are & worse than well out of order. He doesn't even seem to realise that he's claiming hugely better fuel consumption than a proper EFI 4 stroke!!, after the 2 stroke is on full mixture mode spilling fuel all over the place. Well ... Tom so far has to me been a nice guy so i hold in his favour that the measurements had some sort of bug in them. That doesnt have to be intensional. I agree & to be honest he has done me no harm, but equally I see lots of posts from him that are so far off the mark (use a "good" primer before gel coating? what actual boater with any experience could post that advice not once but twice!!?). I'm ever amazed people who I know know don't ping him & of course he relies upon that. Needless to say when I did finally ping him he reacted as BS'ters mostly do; because after a while they actually think people who know believe them when for manners, peace or pity they stay silent. In the end I just have to say what I say & wear the results. On this occasion he doesn't see the need to correct his claims so they stand as a deceptive E-Tec spruiking & all he says is suspect. His claim still uncorrected was a 31ftr at 35 mph on 8-11 gph. The thing with fuel use is also that many boaters eyeball it rather than performing precision measurements... I still hope that Tom will provide more data. He won't that would involve more character than his ego will ever allow:-) To be honest "if" anyone big or small could actually figure out how to run IC engines (or rockets) significantly lean at power, the big people GM, Ford, all the Euro & Japanese based builders would be bashing on their door looking for a license. It's that big a deal it really is. There are a few things against 2DFI motors in cars: - You would NOT survive ANY doubt about their reliability Ford tested Orbital in the UK years ago & as you say ............... the usual excuses of course but Ford walked away. - ANY issue would be VERY costly True but if anything can be made to reliably run lean at power that's huge, they've been trying since the 30s & every attempt so far has failed, Ficht is just the last in a long line. Some of the cars, Mitsubishi & Merc do run lean but never at power. Just idle, over run & very very light load high speed cruise, which modern electronics can manage fairly well. Some even totally turn the fuel off on over run, but most just accept the risks are not worth the minimal gains. - An automotive motor is expected to last 10+ years & an OB that costs the same as a medium car isn't??? - The general automotive crowd does not take as much abuse as boaters do and the automotive crowd seems to be better with class action lawsuits. Boat engines get it easy, they rev but never see real load, the way a fixed pitch prop consumes torque means a correctly propped boat motor can always accelerate if given more throttle right up to max, in a car that's not the case so they can see some serious sustained loads. Fatal if even mildly lean. Aero engines are a good analogy they can be run moderately lean but it's always a risk (the body count proves it) & their specific outputs are lazy compared to a 2 stroke OB even down at 2000rpm. NB they never run anything like as lean as the Ficht/E-Tecs. - You do not have endless amounts of cold water to cool any heat issue That is a good point however in a crankcase transferred 2 stroke the most critical & largest surface area of the combustion chamber (the piston & rings) remains totally un cooled, no matter how cool the head is. - You wouldnt even get the motor close to passing any sort of emission law Yes you would??? I mean the driving force in these E-Tecs is emissions the reason they're runny lean at 35 or 40 to 1 mixtures is to fudge past the EPA regs no other motive at all. The cars (Honda, Chrysler) tried lean in the 60s 70s 80s for the same reasons less fuel, less emissions. - The resources who would work on it would be so small that even if it could work it wouldnt. Same that happened to the Wankel / Rotary engine. A great desin but has no chance to compete with the R&D manpower of the Otto motor The wankel had & still has sealing problems, fuel consumption etc; again in a light little sports or sedan car but if subjected to heavy loads & fuel discipline????? I think the patents on the basic idea expired many years ago so if it had prospects the biggies would be putting R&D into it, after all Ford actually even put money into Orbital testing. If people see a need to turn on me for that - then by all means turn on me. Well I hope they don't & never do, but be aware vested interest is involved here so ............... Well actually its ME who has significant amounts of money invested in a 200 HP Orbital 2DFI motor; If this thing ever blows up, I will be sure to speak about it worldwide .. If it hasn't yet it probably won't Matt, means your boat setup & usage patterns don't subject it to long periods in lean mode under heavy load, followed by sudden full acceleration, which is when we say the trouble hits. We incorrectly thought back when Ficht started that they'd fail while lean with the poor low pressure atomisation but we now say they fail after they return to full mixture around 1500-2000. When lean they are so lean there isn't enough fuel there to sustain damaging detonation. It's significant that they are doing exactly the same as Ficht in issuing software "upgrades" trying to cure "rough spots" at or around the mode change point say 2000. This for me is confirmation the exact same thing is happening in E-Tec that happened in Ficht, but the E-Tec is built stronger so it might tolerate the detonation longer, long enough that their failure rate will let them get away with it????? I'm betting they won't but ...................... Matt K |
#44
posted to rec.boats
|
|||
|
|||
E-Tec problems?????
"M" wrote in message oups.com... because the 150 HP ETec still doesnt exist but the performance data does ... The 150's have been in production for several weeks now. Some of the magazine articles will mention that their tests were done on pre-production motors and the results will be relative, but may not be exactly the same as production units. Bill Grannis service manager |
#45
posted to rec.boats
|
|||
|
|||
E-Tec problems?????
Karen wrote: To be honest "if" anyone big or small could actually figure out how to run IC engines (or rockets) significantly lean at power, the big people GM, Ford, all the Euro & Japanese based builders would be bashing on their door looking for a license. It's that big a deal it really is. There are a few things against 2DFI motors in cars: - You would NOT survive ANY doubt about their reliability - The general automotive crowd does not take as much abuse as boaters do and the automotive crowd seems to be better with class action lawsuits. - You do not have endless amounts of cold water to cool any heat issue - You wouldnt even get the motor close to passing any sort of emission law If people see a need to turn on me for that - then by all means turn on me. The Audi A4 and A6 2006 models are using a lean burn stratified engine with direct injection that they call FSI. You can find the road test from Car and Driver at: http://www.caranddriver.com/article....rticle_id=8781 |
#46
posted to rec.boats
|
|||
|
|||
E-Tec problems?????
"Billgran" wrote in message .. . Karen wrote: To be honest "if" anyone big or small could actually figure out how to run IC engines (or rockets) significantly lean at power, the big people GM, Ford, all the Euro & Japanese based builders would be bashing on their door looking for a license. It's that big a deal it really is. There are a few things against 2DFI motors in cars: - You would NOT survive ANY doubt about their reliability - The general automotive crowd does not take as much abuse as boaters do and the automotive crowd seems to be better with class action lawsuits. - You do not have endless amounts of cold water to cool any heat issue - You wouldnt even get the motor close to passing any sort of emission law If people see a need to turn on me for that - then by all means turn on me. The Audi A4 and A6 2006 models are using a lean burn stratified engine with direct injection that they call FSI. You can find the road test from Car and Driver at: http://www.caranddriver.com/article....rticle_id=8781 the problem I have with the E-tec and all the new 2 strokes is the lubrication system. Not like the old days when lots of lub at all speeds, unless you forgot to mix the oil. |
Reply |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Problems with Navico corus windset | Electronics | |||
Nanni Diesel Engine Problems | General | |||
So where is...................... | General | |||
Diesel starting problems | Cruising | |||
More colon problems! | ASA |