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June 20, 2019, 04:00:46 PM

What cruising speed?

This is a discussion for the topic What cruising speed? on the board Beach Buggy General Help.

Author Topic: What cruising speed?  (Read 847 times)

this user is offline HughBug

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on: December 29, 2018, 07:00:11 PM
Just a quick question, what cruising speed can I expect from a 1600 dual port engine with twin Webers please?

50-55 seems comfortable, 60 gets quite noisy, but if we're on the motorway are we safe keeping up with traffic without stressing the engine too much?

Cheers :)

Hugh the 2nd
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this user is offline snoopy

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Reply #1 on: December 29, 2018, 09:49:40 PM
The gearbox has an effect as 1500-1600 boxes use 4.125 final drive, 1200-1300 boxes use 4.375 and  GT boxes with 3.875 so a 1200-1300 box needs more rpm per MPH.
the other factor is rear tyre size a larger diameter is less engine revs.
The wifes Jas has 1600 box and 31/10.5 X 15 tyres and sits happily at 70

Air cooled motors were designed to run at near flat out speeds as you only get 4400 rpm as opposed to 5,500 plus on other motors


this user is offline HughBug

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Reply #2 on: December 29, 2018, 10:03:14 PM
Thanks very much, so if necessary (unlikely) I can keep a steady 70 and not worry ;-)up

Cheers :)

Hugh the 2nd
A little knowledge is a dangerous thing........warning - this user has very little knowledge 😊


this user is offline pepsi81

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Reply #3 on: December 29, 2018, 11:34:28 PM

As Snoopy  says, your limit is the gearbox ratio. Ivan cruise along at 60-70 no problem ( 1776 etc + 1200 gearbox). Can faster, but it ges a bit Leary at speed. Pretty sure I could nax’ 5000 😍😍😩😎😎😎😎😎


this user is offline Zip Buggy

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Reply #4 on: December 31, 2018, 05:22:46 PM
Mine is a 1600TP that revs to around 5500/6000 with twin IDF 40s, running with a 1300 box. Top speed is around 85 (true) and it happily cruises at 70.
Who needs prozac when you can drive a buggy?


this user is offline Dave DND

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Reply #5 on: December 31, 2018, 05:40:18 PM
I wrote a spreadsheet many moons ago that may help you

Enter your tyre sizes and the rest should be self explanatory

www.beachbuggy.info/DNDGearboxCalc.xlsx

 8)
01803-391680
dave@dndservices.co.uk



this user is offline HughBug

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Reply #6 on: December 31, 2018, 06:01:04 PM
I wrote a spreadsheet many moons ago that may help you

Enter your tyre sizes and the rest should be self explanatory

www.beachbuggy.info/DNDGearboxCalc.xlsx

 8)
Excellent, thanks !
Took it up to 75 yesterday (by accident of course), seemed like there was more in reserve, and no wandering across the road ;)

Cheers :)

Hugh
A little knowledge is a dangerous thing........warning - this user has very little knowledge 😊


this user is offline Doon L004

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Reply #7 on: January 01, 2019, 08:45:23 PM
Hugh

I run a 1600TP with a single weber and she will cruise at 70 mph no problem, I drive on my rev counter and 3500 rpm is a shade under 70 mph.

http://www.chris-jordan.org.uk/_media/engine-rpm-road-speed.pdf

hris


this user is offline HughBug

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Reply #8 on: January 01, 2019, 10:24:12 PM
Thanks for that. I'm just trying to be careful - you know, 50 year old engine and all that, but it seems I needn't worry too much.
The seller claimed an engine rebuild not long ago, but you never know what was really done.

The damn thing is so much fun to drive, I can't help letting it fly now and then. We had RIBs (semi rigid inflatable boats) at work in the '90s and they originally had bucket seats and powerful outboards - driving a buggy is almost as much fun but without the wetness ;)

Cheers :)

Hugh the 2nd
A little knowledge is a dangerous thing........warning - this user has very little knowledge 😊


this user is offline Paul1953

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Reply #9 on: January 02, 2019, 07:53:32 AM
almost as much fun but without the wetness

Ha Ha Hugh...   this is yet to come.  All the best for 2019  ;-)(-;


this user is offline HughBug

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Reply #10 on: January 02, 2019, 08:51:16 AM
Won't be planning to go out in it, but no problem driving in the rain; got plenty of motorbike gear  ;-)up

Happy New Year - we may even put in an appearance somewhere one day...

Cheers :)

Hugh the 2nd
A little knowledge is a dangerous thing........warning - this user has very little knowledge 😊