continuing a debate from a recent thread in the young dubbers section, we been discussing this.

Poeple have said and contributed that u could drive it at 5000 revs no worries, others say that 4000 should be the limit and that the vw was just not build for it.

I can say i have heard it being called a low rev engine, but i been brought up to be rough with em.

What you'se rekon? Would high revs kill em fast? or just heat/dirt more than anything?

we been discussing what is stronger too. would a 1300/1500 handle it better? (i rekon they would as the SP on those engines acts as a rev limiter unlike the 1600TP), when it comes to a 1100 or 1200 early engine, well, no idea.

Join in, babble, be incoherant, but no BITCHING or CRAP. cough cough (whispers a few names of individuals whom i am growing dislike for)...

Some people say that the stock intake manifold and the stock muffler restrict airflow enough to act as a rev limiter, so just go flat stick as fast as you can... For me, sounds like the engine is absolutely screaming at that pace and i'm pretty mechanically sympathetic, so i don't push it past 100-105ish. I'll do 110 if it's in cold weather so I don't risk overheating (i've got crappy fitting tinware) I think 5 grand on the tacho is a bit too much. 4500 would be a safer limit in my mind.. the stock crank aint counterweighted, so the vibration (in the long term - depending on the condition of your engine) wouldn't be such a great thing... That said, VW designed the bugs to sit on 100kph all day with no worries...

my 2 pesos..

That makes sense. IT is a very interesting debate, well i find is. Hopefully will pick up a bit during peak hr this arvo.


what engine u running tofu?

Hi Chris,
the early 40 HP 1200cc engines had restricted breathing so You could go as fast as they would go -- all day....

The maximum horsepower came in at 3900 rpm..
41.5 BHP [SAE] [so My books say...]

the 1300cc engine has 50 BHP [SAE] at 4600 rpm..

the 1500cc engine has 53 BHP [SAE] at 4200 rpm..

the 1600cc Dual port engine has 62 BHP [SAE] at 4000 rpm...

This engine can be revved faster as it does NOT have the restricted breathing of the single port engines...

Lee

very interesting figures Lee

the 1300 and 1500 being restricted, could u push em as hard as they go with no worries?

I wouldnt think 5000rpm for long periods of time in a stock 1600 would be a good move..... thinking in real terms, with a single side plate L bug box, thats about ..... ummm about 150 - 160kmh (in 4th) I think (someone will know for sure).

I have an 1835 with counterweighted crank, heavy duty single valve springs and fully balanced - the most I've revved it to is 6500, and I use 6000 as a redline, I just dont feel comfortable above that. In my case, its two things - the standard rocker gear (which I know Pobjoy engines use upwards of 6000rpm, but I'm not Stan) and the fact my Kadrons / cam combo doesnt make much power past about 5800, so there is no point in revving further.

6000 is a nice red line.

u build ur engine? If so, got a thread? if not where u got it from?
does the 1835 engine seem to be a good runner? any issues?

Cheers doug

1500sp motors i thought were industrial motors and built tough as... designed to go 24/7.

the 1300tp stocker i had with 205/55/r15s would rev itself out to about 5500 on the M1 at what said like 85mph on the clock lol but obviously wasnt.

nick

i'm running a 1200 40HP with a 30 PICT carb and extractors and a hotdog...I think i've gottet to 110 before... my speedo is way off!

>the 1600cc Dual port engine has 62 BHP [SAE] at 4000 rpm...

This engine can be revved faster as it does NOT have the restricted breathing of the single port engines...

Lee<

Why did VW actually make the dual port heads??

DH

PS. Maybe a trick question!!

To rev faster?

lol, think thats too easy of an answer to be right... i'm sure theres a more detailed answer.

there's not much past 4200 RPM on a stock 1600 DP though...just a lot of noise.

I built the 1835 after work at our VW mechanics (he put the bottom end together) about 3 and a half years ago. I didnt take any photos unfortunately.

Its a good motor, the only thing I did wrong was I didnt research my cam choice very well, and I have a mismatch between the HSC #2 cam and my KAdron carbies. It would probably be a much nicer car to drive with a basic Engle 110 - the HSC#2 doesnt come on until around 3000rpm, which can make it a pain to drive on a cold winters morning - especially with no vacuum advance.

Hi Chris,

Probably the best thing with Dual or Twin port Heads is that they can be used on a 1641, 1775 or 1835 cc
engine with good results....

especially with Twin, dual throat carburetors....

Two things happened with Dual port engines...

More horsepower and better acceleration....
although both only marginal...
but with a fuel use increase.... less MPG...

I have read where a 1600 single port engine has slightly
more Torque than a Dual port 1600 engine....
but Less Horse Power..
and much better economy.... MPG...

Lee

To rev faster?

lol, think thats too easy of an answer to be right... i'm sure theres a more detailed answer.<

A really complicated answer Chris! It was only to put fuel injection on the heads and the performance on both single port and dual port were exactly the same according to the experts, Volkswagen.

DH

hmm, certainly very interesting indeed.

I have to say, this is a very informative read for me.
Cheers guys

Apparenlty the 1500 single port heads fit the 1600 barrels, so might be an option. At the moment, trying to grab a good running 1500SP that was originally from my car (got all the other semi auto gizmo's on it), and will see where i can go from there.

Will have to also start another thread about fitting a tacho meter, and recommended packages for that.

[ Edited on 8/6/2006 by bajachris88 ]

stock spring will let the valves float around 6k

valve and points bounce are rev limiters in a vw engine LOL
i got h/d springs and electronic ignition in mine
with twin carbs, free flowing exhaust system and a bit of head work my 1600 revs out to around 5500rpm

doug - with single side plate box and the 17" rims it had on at the time ive clocked it to around 170 it was doing about 5 grand
but i wouldnt do it for too long, bearing seats wont like it

Joel


[ Edited on 8-6-2006 by DUB74L ]

this makes me wanna whack my worn out old 1300TP (i think) in my baja and see how high it revs! never felt comfortable above 4000rpm...

>1500sp motors i thought were industrial motors and built tough as... designed to go 24/7.

the 1300tp stocker i had with 205/55/r15s would rev itself out to about 5500 on the M1 at what said like 85mph on the clock lol but obviously wasnt.

nick <

>Apparenlty the 1500 single port heads fit the 1600 barrels, so might be an option. At the moment, trying to grab a good running 1500SP that was originally from my car (got all the other semi auto gizmo's on it), and will see where i can go from there.<


ALL 1500 engines were originaly single port starting with the 1500 Type 3 of 1961. The first of the 1600 engines (66 Fastback etc) was also single port as was the 1300 engines which came out at around the same time.

With this in mind, all single port and dual port heads will accept the 1600 cyls without alteration.

My S has standard single port heads running 1600 pots at 8.5:1 comp as was the original 1500S engine. Good economy and cruises well on highway along with reasonable torque.

DH



[ Edited on 8/6/2006 by 1500S ]

When I had my first beetle (1300 TP) it was a couple of years old and in perfect condition I would have my foot to the floor and let it go as fast as it could which was about 85MPH, I later found the revs to be around 4000 rpm. Eventually (years later) I had an 1835 cc in the same car that would rev to 7500 rpm-good fun,expensive and not nearly as reliable! Now though with VWs getting so old and not always knowing the history of some parts I just try to go with reliability rather than speed (I've got to say this as the wife keeps looking over my shoulder)

funny ancientbugger - i have a 73 std 1300tp in the same case as you described - which now has an 1835 that will go 7k... lol... crazy times

nick

depends how hard chris88,

there is hard, and then hard.

respectfully hard? the car should go all day

abusively hard..... b-a-n-g

kkk

buy a roadworthy going car and get your bloody liscence chris!

I had a stocker twin port only with 1640 barrells on it. I thought it would only get out 4500, but I once had to overtake a truck in a 60zone and I had it out to 5000rpm in second gear. It was screaming but it did it without an issue.

I was told by my mechanic that the PICT carbies/stock intake manifold act like a rev limiter. He's built offroad racing motors with PICt carbies and you can drive them foot flat airbourne over jumps and not worry about over-revving.

forget 'will' it do it... i'd be asking 'why' do it?

by the way, i got my IDIOTS GUIDE!! Its the bomb, but the look of it!

Hey Chris
The stock cam in a 1600 lets the engine rev to 5500rpm. If the valve springs are tired then you'll get valve bounce a bit below that. The camshaft grind determines the rev limit of any engine so some wild cams and heavy duty valve springs will allow you to rev to 8000rpm or more but as others said sustained high revs WILL cause more engine wear no matter what and is not good for the bearing journals in the case.
The aircooled stock VW engine is capable of running at full output for long periods of time.
Hope this helps.
Cheers, T :thumb