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If you are travelling 80mph in a 1600 how many rpm will u be doing?

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shaihulud Custom Title Time!

1,448 posts · joined Nov 2005 ·

#456097
I agree with squizzy. keep the speed down. VW engines don't like to rev too high for hours on end.

When I drove my buggy from Canberra to Perth via Highway 1, I put a PERTH OR BUST sign on the back, ticked over at 95/100 km/h, got lots of toots and waves and once, with a tail wind I got 45 mpg out of it. The engine sang along as sweet as you like the whole way.

At 120km/h she was noisy, rattly, thrummy, and getting unstable.

Don't try to keep up with modern traffic if you want your engine to last.

ian.mezz I never said, I could write or spell

3,913 posts · joined Sep 2004 ·

#456156
think about it if your cars 30 years old things are a bit sad and if you drive any old car hard it will brake sooner then later,:cry
having said that i had a standard 69 1500 beetle and it was just in the zone at 70 mph just buzzing along.

[ Edited on 14-2-2006 by ian.mezz ]
😂🤪😂🤪😂
car forums. where a lot of peoples good intentions end up taking a good old car off the road forever never ever to see the road again. 🥲

wombatone Seriously Crusin Dubber

167 posts · joined Aug 2002 ·

#456187
I just built up a 1600 tp test motor to see what would happen if I machine of the piston skirts and lighten every thing off. My 61 bug with 1500 box and 195/65/15 will now reach 90 mph not a problem. I have been cruising in to work 40 km at 75-80 mph all summer. The only problem I have had is the motor was getting so hot I was getting fuel vaporisation on the 40C plus day so I put an elec. fuel pump on it. Am looking forward to pulling it down and seeing how it’s holding up. My tacko dose not read correctly so I have know idea what revs I’m pulling. Think I’m getting signal interference through the wire from the coil, and one had this problem?

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#456208
XXX-1.8T wrote:ok so back on topic will i blow my engine or gearbox do 80mph.

Im running 165's rear and 135's at the front!
highly unlikely to blow gearbox

the engine will let go first.

you are approaching the redline at that speed (assuming a stock bottom end)

that is not a recomended cruising speed, however o.k for passing (short bursts)



[ Edited on 14-2-06 by dumone ]

modulus Veteran Volks Folk

2,009 posts · joined Jul 2003 ·

#456218
XXX-1.8T wrote:ok so back on topic will i blow my engine or gearbox do 80mph.

Im running 165's rear and 135's at the front!
With this tyre combination, your speedo will be quite optimistic unless it has been recalibrrated, i.e. an indicated 80 mph would be somewhat less in reality. How are you judging your speed?

hth
Peter Hill
1975 Type 2 Double Cab
modulus.com.au

XXX-1.8T Bishop of Volkswagenism

3,113 posts · joined Oct 2002 ·

#456267
Im judging the speed from my speedo.

And my engine is a rebuilt balanced 1600 2.5 years old with an engel cam and now with twin kads and stock exhaust.

So can it still let go @ 80mph on short bursts?

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#456269
if there is something wrong, they will let go at any r.p.m

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#456271
modulus wrote:
XXX-1.8T wrote:ok so back on topic will i blow my engine or gearbox do 80mph.

Im running 165's rear and 135's at the front!
With this tyre combination, your speedo will be quite optimistic unless it has been recalibrrated, i.e. an indicated 80 mph would be somewhat less in reality. How are you judging your speed?

hth
speed variations will depend on profile of the tyres, and the width

like wise with rpm and rear tyre profile

[ Edited on 14-2-06 by dumone ]

[ Edited on 14-2-06 by dumone ]

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#456272
XXX-1.8T wrote:Im judging the speed from my speedo.

And my engine is a rebuilt balanced 1600 2.5 years old with an engel cam and now with twin kads and stock exhaust.

So can it still let go @ 80mph on short bursts?
now we are getting some info!

is the crank counter weighted

lugnuts Custom Title Time!

1,070 posts · joined Aug 2002 ·

#456273
XXX-1.8T wrote:ok so back on topic will i blow my engine or gearbox do 80mph.

Im running 165's rear and 135's at the front!
Hi Costa are they 135/80/15?
Dont listen to what they say,just watch what they do.Oh yeah ive NEVER finished anything ive started.:o

XXX-1.8T Bishop of Volkswagenism

3,113 posts · joined Oct 2002 ·

#456279
all i know the engine has been balanced.

the tyres are Michelin 135 ZX's not sure of the profile but they are lower profile than my 165's

Adam_C Custom Title Time!

1,180 posts · joined May 2003 ·

#456283
why the hell should front tires matter. they throw the speedo out a little. but not too much in my car (according to the gps) the rear profile is the only one that affects the revs/mileage etc etc
Adam
Adzslick@iprimus.com.au

modulus Veteran Volks Folk

2,009 posts · joined Jul 2003 ·

#456292
dumone wrote:
modulus wrote:
XXX-1.8T wrote:ok so back on topic will i blow my engine or gearbox do 80mph.

Im running 165's rear and 135's at the front!
With this tyre combination, your speedo will be quite optimistic unless it has been recalibrrated, i.e. an indicated 80 mph would be somewhat less in reality. How are you judging your speed?

hth
speed variations will depend on profile of the tyres, not the width

like wise with rpm and rear tyre profile

[ Edited on 14-2-06 by dumone ]
The height of a radial tyre is determined by the width X the profile; 'speed variations' will therefore depend on the width and the profile. Between a 135 and a 155 front tyre there is about 5% difference in diameter, directly affecting the speedo accuracy, assuming that 155's are equivalent to standard issue. Couple with a relatively large (comparatively) width (and therefor diameter) rear tyre, the actual engine RPM at an indicated 80 mph might be quite low compared with the rpm of s standard tyred bug. Which, after all, is directly relevant to the amount of engine stress at and indicated 80 mph.

If, as XXX-1.8T has indicated above, the front tyres are lower profile than the rears, then the above differences and their effects are magnified.

hth

[ Edited on 14-2-06 by modulus ]
Peter Hill
1975 Type 2 Double Cab
modulus.com.au

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#456297
modulus wrote:
dumone wrote:
modulus wrote:
XXX-1.8T wrote:ok so back on topic will i blow my engine or gearbox do 80mph.

Im running 165's rear and 135's at the front!
With this tyre combination, your speedo will be quite optimistic unless it has been recalibrrated, i.e. an indicated 80 mph would be somewhat less in reality. How are you judging your speed?

hth
speed variations will depend on profile of the tyres, not the width

like wise with rpm and rear tyre profile

[ Edited on 14-2-06 by dumone ]
The height of a radial tyre is determined by the width X the profile; 'speed variations' will therefore depend on the width and the profile. Between a 135 and a 155 front tyre there is about 5% difference in diameter, directly affecting the speedo accuracy, assuming that 155's are equivalent to standard issue. Couple with a relatively large (comparatively) width (and therefor diameter) rear tyre, the actual engine RPM at an indicated 80 mph might be quite low compared with the rpm of s standard tyred bug. Which, after all, is directly relevant to the amount of engine stress at and indicated 80 mph.

If, as XXX-1.8T has indicated above, the front tyres are lower profile than the rears, then the above differences and their effects are magnified.

hth

[ Edited on 14-2-06 by modulus ]
i know, i should of had "and" in there instead of "not" hey, sorry

we should have asked for more info right from the start too

tyre size and profile front and rear...

which 1300 box-the late or early

engine mods-specifically bottom end, cooling aids/mods?................

we are learnning more tho as we get along.

:kiss

[ Edited on 14-2-06 by dumone ]

XXX-1.8T Bishop of Volkswagenism

3,113 posts · joined Oct 2002 ·

#456318
nah no other mods thats about it.

The 1300 gearbox not sure if its early or late car was made on the 16 July 1965 and was rego'd in Australia in 1966.

Heres a pic of my baby:



:beer

hellbugged 48's and straight cuts

5,080 posts · joined Apr 2003 ·

#456323
nice ride, classic to imagine that rounding up the non-believers at 80mph:thumb

lugnuts Custom Title Time!

1,070 posts · joined Aug 2002 ·

#456347
Bit hard to say,but,if your tyres are ZX 135 SR 15 then they have a circumferance of 1821mm and diameter of 600mm and width of 137mm,therefore i think your speedo which runs off the front tyres will read 9-10% too high.So if correct your now doing 72mph and about 4000rpm,but hey these are my guesses with limited research so its possible im wrong,and on the bright side at least my post count is goin up :thumb
Dont listen to what they say,just watch what they do.Oh yeah ive NEVER finished anything ive started.:o

XXX-1.8T Bishop of Volkswagenism

3,113 posts · joined Oct 2002 ·

#456403
so now we are getting to the bottom of things👍

so u reckon 72mph in 4th would be 4000rpm

what the redline on a 1600?

lugnuts Custom Title Time!

1,070 posts · joined Aug 2002 ·

#456458
4400rpm :thumb
Dont listen to what they say,just watch what they do.Oh yeah ive NEVER finished anything ive started.:o

XXX-1.8T Bishop of Volkswagenism

3,113 posts · joined Oct 2002 ·

#456468
cheers!