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roofchop Seriously Crusin Dubber

177 posts · joined Jan 2011 ·

#1012861
How come old stocker motors get 40 hp, but a newly built 1916 only gets 75hp?

From an ad in VWA, new block, crank, pistons/barrels, heads with bigger valves, dual Kadronns cam etc etc. Dynoed at 75!

I had loads of Alfa's....... 1500's and 1700's and they were all tyre shreaders!

(from Wiki....)
Engines

1971–1983 1.2 L (1,186 cc) Alfa Romeo Boxer H4, 63–68 hp
1977–1983 1.3 L (1,286 cc) Alfa Romeo Boxer H4, 75 hp (56 kW)
1978–1983 1.4 L (1,350 cc) Alfa Romeo Boxer H4, 79 hp (59 kW)
1978–1983 1.5 L (1,490 cc) Alfa Romeo Boxer H4, 85–105 hp (63–78 kW)
1987–1989 1.7 L (1,712 cc) Alfa Romeo Boxer H4, 118 hp (88 kW)

See what I mean? Maybe the water makes them powerfuller😂

Where are all the horses going?😠

fish26 Fahrvergnugen

903 posts · joined Jul 2007 ·

#1012865
1916 with 75hp makes 90hp at flywheel not too bad almost doubling the factory specs and this is from an engine initially designed in the 20s.
Also having a few Alfas myself, both cars are worlds apart in technology purely due to Alfas race experience hence making more paper HP given same cc.
I guarantee you that 75hp beetle will spank the pants off a GTV6 any day of the week and twice on Sunday, the Alfa does turn and brake better though.
bitten by the bug..........several times

Bizarre Moderator The artist formerly known as blue74l

12,785 posts · joined Aug 2002 ·

#1012869
and the Alfa V6 sounds sweet!

But yes - you are comparing 1930's engine technology with 1980's

The poor old VW motor didnt progress much

75 Rear wheel HP is about right - and aint too shabby in an 800kg car with decent shocks and tyres

As for the 1600 - that 40HP is paper HP
I have not seen many 1600 with 40 ponies at the wheels
Futue te ipsum!!!

matberry Moderator Go hard or go home

8,114 posts · joined Mar 2006 ·

#1013114
How come some 2347's make 120hp and some 2007's make 135.....??? there are many factors, it's in the details, a good combo, quality of parts, attention to detail on assembly and so many more factors
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE

Ampdub Officially Full-On Dubber

310 posts · joined May 2006 ·

#1014249
Im always questioning about HP when the dyno day results are published in the mag, so much variance.

helbus Administrator Mad fabricator, paint and body

7,386 posts · joined Sep 2002 ·

#1014251
Just remember HP and torque are different aspects of an engine build.

You can build a torquey engine that has a smooth consistent acceleration from standstill with good tourque over a good useable street range.

Or you can build a real powerful race engine that has to be on the boil continuously to get maximum performance, and has to be in specific rev ranges in the right gear. Great power when it is.
EJ22 into Bay Microbus - Finished project build thread- click on this spot here for info

Doug Sweetman Nil Bastardo Carborundum

2,128 posts · joined Sep 2002 ·

#1014258
Compression ratio is low.... Due air cooled and 80 year old design..... Also volumetric efficiency is very low compared even to an eighties design

colin Fahrvergnugen

984 posts · joined Mar 2007 ·

#1014271
matberry wrote:How come some 2347's make 120hp and some 2007's make 135.....??? there are many factors, it's in the details, a good combo, quality of parts, attention to detail on assembly and so many more factors
x2

Cheers Col

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#1014274
roofchop wrote:How come old stocker motors get 40 hp, but a newly built 1916 only gets 75hp?

From an ad in VWA, new block, crank, pistons/barrels, heads with bigger valves, dual Kadronns cam etc etc. Dynoed at 75!

I had loads of Alfa's....... 1500's and 1700's and they were all tyre shreaders!

(from Wiki....)
Engines

1971–1983 1.2 L (1,186 cc) Alfa Romeo Boxer H4, 63–68 hp
1977–1983 1.3 L (1,286 cc) Alfa Romeo Boxer H4, 75 hp (56 kW)
1978–1983 1.4 L (1,350 cc) Alfa Romeo Boxer H4, 79 hp (59 kW)
1978–1983 1.5 L (1,490 cc) Alfa Romeo Boxer H4, 85–105 hp (63–78 kW)
1987–1989 1.7 L (1,712 cc) Alfa Romeo Boxer H4, 118 hp (88 kW)

See what I mean? Maybe the water makes them powerfuller😂

Where are all the horses going?😠
simple put they are a shit engine design and aftermarket lacks of proper r & d to address these issues.

Some people can build them good, but much much harder than starting with a good engine design to begin with.

this is why I favor t4 engine as a platform to build on, they yield far superior results and are much much more reliable to boot. And we have at least one builder that has all aspects of r & d for them covered 100%

we are talking about 30+ year difference in engineering t1 vs t4.


This is also what is driving engine conversions in VWs as we all seek better, cheaper, faster, efficient and reliable engines.

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE

vlad01 Compulsive Aussie Vee Dubber

4,270 posts · joined Jun 2010 ·

#1014275
just to put it into prospective, a piss poor briggs n stratton v twin makes more hp/L than a 1600 stock vw engine lol.

Even more so for the single cylinder versions haha

71 notchback,
Past owner of, 70 NB, 73 SB and 72 FB TLE