Hi all,
This discussion of midget top speed has been going on for a couple of
days now, so I thought I'd throw in my $0.02 worth.
The clarify ( or muddy) the waters a little, I looked up the rear axle
ratio
for the midget and found numbers like 3.90x1 and 4.22x1 depending on
year, motor, etc. If you assume a tire size of 165HR70x13 (I don't know
midget tire sizes, so I took a guess for 13 inch rims), and calculate the
circumference of the tire, you get about 69.412 inches or 5.7843 feet.
Take 1000 rpm x 60 = 60000 revs per hour / 3.9 = 15384.6 revs at the
axle (3.90 gears) x 5.7843 = 88989.2 feet/hr /5280 = 16.85 mile per hour
per 1000 rpm engine speed ( 15.57 mph / 1krpm for 4.22 gears).
Therefore with these tires, your midget should do 77.8 mph with the 4.22
gears and 84.25 mph with the 3.90 gears. Other tires sizes in this range
should yeild close to the same results. (All these number assume that
there is no clutch slippage, etc...)
To boil it all down, if your only getting 50 mph at 4 or 5 thousand rpm,
then you've either got 10 inch wheels, or something is bad broke.
My $0.02...
Harlan
'70 BGT
-----Original Message-----
From: Orjan Lovoll (BEST Consulting) <a-orjanl@microsoft.com>
To: 'robert weeks' <robert@woozy.com>; mgrazian@ltcm.com
<mgrazian@ltcm.com>; mgs@autox.team.net <mgs@autox.team.net>
Date: Monday, June 08, 1998 1:11 PM
Subject: RE: Midget Top Speed
>Consider yourself lucky.
>
>My 67 Midget can barely hit 60 without redlining. At least I think it is
>sixty. I just kinda take an average of the low and high points the needle
>tends to bounce between.
>Any faster and my spoke wheels give me the speed wobbles anyway. :)
>
>Gotta love it.. built in saftey features.
>
>
>
>-----Original Message-----
>From: robert weeks [mailto:robert@woozy.com]
>Sent: Saturday, June 06, 1998 6:16 PM
>To: mgrazian@ltcm.com; mgs@autox.team.net
>Subject: Re: Midget Top Speed
>
>
>Hi,
>
>That's definately not correct. I had the Midget out this a.m. and looked at
>what speed I was getting at what rpm: I hit 50mph @ 4000rpm in second gear,
>70 @ 4000 in 3rd gear, and the fastest I've had it in 4th gear was 95mph
>and I wasn't looking at the tach that time ;-)
>
>Sounds like either your spedo is way off or your clutch is slipping pretty
>badly, I'd vote for the slipping clutch.
>
>Good luck,
>
>Robert Weeks
>Durham NC
>1969 Midget
>1968-70 Abitza
>http://www.woozy.com/midget/
>
>At 9:19 AM -0400 6/5/98, Michael Graziano wrote:
>>Hey all.
>>
>>I drove my 1500 Midget to work today on the highway (for the 1st time).
>It's
>>top speed was around 50mph @ 4500RPM. Is this correct or is there
>>something else the matter?
>>
>>Mike
>>
>>'78 MIdget
>>'87 300zx
>
>
>
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