RV.Net Open Roads Forum: Tech Issues: 15k BTU on 2200 watt generator

RV Blog

  |  

RV Sales

  |  

Campgrounds

  |  

RV Parks

  |  

RV Club

  |  

RV Buyers Guide

  |  

Roadside Assistance

  |  

Extended Service Plan

  |  

RV Travel Assistance

  |  

RV Credit Card

  |  

RV Loans

Open Roads Forum Already a member? Login here.   If not, Register Today!  |  Help

Newest  |  Active  |  Popular  |  RVing FAQ Forum Rules  |  Forum Posting Help and Support  |  Contact  

Search:   Advanced Search

Search only in Tech Issues

Open Roads Forum  >  Tech Issues

 > 15k BTU on 2200 watt generator

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 8  
Prev  |  Next
Sponsored By:
otrfun

Desert SW

Senior Member

Joined: 09/08/2012

View Profile



Good Sam RV Club Member


Posted: 02/10/19 11:38pm Link  |  Quote  |  Print  |  Notify Moderator

twodownzero wrote:

otrfun wrote:

Honda EU2200i has an OHC 121cc engine vs. the new Yamaha's EF2200iS 79cc OHV engine. IMO, an OHC engine is an inherently better, more efficient design.
What is better about an OHC design? I understand the desire for the larger displacement (more power to turn the actual generator). But I find both of your other claims to be questionable at the last.

There's nothing more efficient about an OHC over a conventional OHV design. Some of the best, most efficient, and most powerful engines on earth use OHV engines. 2 of the big 3 use OHV gasoline engines exclusively in their full size trucks, and Ford just released details on their newest engine, and guess what? It's OHV. There is nothing wrong with OHV engines. I'll admit by bias, though. I won't own ANY vehicle with an overhead cam engine. I have zero interest in them and to this day, I'm convinced they are a solution in search of a problem to solve.

Also, if 79ccs will make enough horsepower to create the rated output, I also dispute that a 121cc engine to do the same thing will be more efficient. Gasoline still burns most efficiently at 14.7:1, and an engine almost twice the size will have to burn more fuel even at the same load, unless there is some kind of vast disparity in design where friction or some other variable makes up the difference (not likely).
No, there's nothing wrong per se with an OHV engine. OHV is fine for lower RPM applications like the lower revving, high torque truck applications you speak of. However, you'll rarely see OHV in high-rpm applications. An OHC design has a lot less moving mass in the valve train assembly (vs. an OHV design) which allows for more efficient, accurate control of the valves at higher rpm's. This is the reason why the vast majority of cars on the road on the road today use an OHC configuration. If OHV was a better design I assure you car manufacturers would use it---but, the fact is they don't.

I'll think you'll find the 121cc Honda has very similar fuel consumption ratings as the 79cc Yamaha. With all things being equal, I'll always vote for the stronger mass of a larger displacement engine. When I said "more efficient design" I was referring to increased mechanical efficiency an OHC engine offers vs. an OHV engine (as I noted in the previous paragraph).

All said and done, YMMV. You prefer OHV. I like OHC. That's ok--lol!

* This post was edited 02/11/19 12:06am by otrfun *

jjrbus

FT Myers FL

Senior Member

Joined: 07/19/2008

View Profile


Offline
Posted: 02/11/19 05:49am Link  |  Quote  |  Print  |  Notify Moderator

marcsbigfoot20b27 wrote:

My 13.5K with 59 LRA would not start in Phoenix @1400 ft if over 60 degrees with my EU2000i.

Added a Micro Air Easy Start, would not start reliably over 85-90 degrees.


Switched to EU2200i.......tested it at 115 degrees in ECO mode and it starts and runs fine.
Tested at 7600ft ~80 degrees in ECO mode started and ran just fine.

Tested my 2200 at the end of the break in, maxed at 2400 watts to electric heaters, not sure how long it would go at max.


Thanks for a detailed response.

SpeakEasy

Western New York

Senior Member

Joined: 04/22/2016

View Profile


Offline
Posted: 02/11/19 09:51am Link  |  Quote  |  Print  |  Notify Moderator

As no one has yet suggested the following, I will.

Contact Micro Air directly and ask them your question. They will work with you to select a generator that will do the job. They have tested many of the smaller generators with their product, and they can advise you as to which ones can do the job and which ones cannot. They are incredibly helpful.

-Speak


It's just Mrs. SpeakEasy and me now (empty-nesters). But we can choose from among 7 grandchildren to drag along with us!



2014 F-150 Super Crew Short Bed 3.5L Ecoboost
2014 Flagstaff Micro Lite 23LB


2oldman

Salton Sea

Senior Member

Joined: 04/15/2001

View Profile


Online
Posted: 02/11/19 10:01am Link  |  Quote  |  Print  |  Notify Moderator

2 of the 2200's would easily do the job.

TomG2

Central Illinois

Senior Member

Joined: 03/07/2004

View Profile



Posted: 02/11/19 12:46pm Link  |  Quote  |  Print  |  Notify Moderator

Two 2000's would easily do the job also.

Chum lee

Albuquerque, NM

Senior Member

Joined: 08/03/2015

View Profile


Offline
Posted: 02/11/19 03:58pm Link  |  Quote  |  Print  |  Notify Moderator

"What is better about an OHC design?"

Among other things not already listed, when you have a DOHC (or Dual Overhead Cam) design, it allows both the intake and exhaust cams to be timed differently (varied to each other) at different RPM's. Honda's VTEC engine to name one. That option allows the engineers to optimize the valve timing for the entire range of RPM's allowing the engines to generate substantially more power with minimal flat spots in the power curve. That's for complex high performance engines which typically generators are not. OHC's also make it easier to have 3, 4, and 5 valves per cylinder which can be done with OHV engines, but not as easily. Now, . . . back to your regularly scheduled program.

Chum lee

marcsbigfoot20b27

Phx

Senior Member

Joined: 08/24/2013

View Profile



Good Sam RV Club Member

Offline
Posted: 02/11/19 04:23pm Link  |  Quote  |  Print  |  Notify Moderator

First off , 79 cc engine vs 121 cc engine.
Rated output is at sea level, probably 59 degrees F.
Now go to 115 degrees and or 9000 ft and see if the smaller engine still makes the rated power. I think a Honda went big on the engine to satisfy more variables.

Now about OHV vs OHC.
All car/truck engines ( not rotaries )besides flat head fords are over head valves, they use center block cams and pushrods and rocker arms. With this design you can make a more narrow engine because the heads are not as wide or tall. Going OHV you can stuff a V8 in a small car like a corvette.

OHC engines do great at higher rpms and the heads flow more within 4 or 5 valves per cylinder. Most new cars especially 4 or v6 are “hemispheric”. They get good mileage and make more power up top. Go with a big engine bay like a truck and stuff a DOHC engine like a hemi style and you are really cooking, just need space and it costs more to make.

time2roll

Southern California

Senior Member

Joined: 03/21/2005

View Profile



Good Sam RV Club Member


Posted: 02/11/19 04:50pm Link  |  Quote  |  Print  |  Notify Moderator

What generator runs dual cams and 8,000+ rpm? Does Ferrari make generators?


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
675w Solar pictures back up

TomG2

Central Illinois

Senior Member

Joined: 03/07/2004

View Profile



Posted: 02/11/19 05:21pm Link  |  Quote  |  Print  |  Notify Moderator

1957 Chevrolet, 283 Cubic inches. 1957 Ford, 312 Cubic inches. If you ever raced either one, you will know a little about engine size, power, and efficiency, In case you weren't around, the smaller engine prevailed. The saying was that the only way to get a Ford to go fast was to push it off a cliff.

marcsbigfoot20b27

Phx

Senior Member

Joined: 08/24/2013

View Profile



Good Sam RV Club Member

Offline
Posted: 02/11/19 08:01pm Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

What generator runs dual cams and 8,000+ rpm? Does Ferrari make generators?


I might enjoy listening to a Ferrari generator if it sounded like their cars, lol.

Reply to Topic  |  Subscribe  |  Print Topic  |  Post New Topic  | 
Page of 8  
Prev  |  Next

Open Roads Forum  >  Tech Issues

 > 15k BTU on 2200 watt generator
Search:   Advanced Search

Search only in Tech Issues


New posts No new posts
Closed, new posts Closed, no new posts
Moved, new posts Moved, no new posts

Adjust text size:

© 2019 CWI, Inc. © 2019 Good Sam Enterprises, LLC. All Rights Reserved. | Terms of Use | PRIVACY POLICY | YOUR PRIVACY RIGHTS