OzVMX Forum

Marque Remarks => CZ => Topic started by: Ji Gantor on January 16, 2009, 10:34:30 pm

Title: CZ380 71 42hp V CZ400 73 37hp
Post by: Ji Gantor on January 16, 2009, 10:34:30 pm

I have just looked at the compliance plates of both the 71 and 73 CZ 380's and noticed that the 71 has 42 hp while the 73 only has 37hp.

As Julius Sumner-Miller used to say

WHY IS THIS SO   

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: holeshot buddy on January 16, 2009, 11:01:24 pm

those figures seem a bit inflated to me
czs are good bikes but ::)
were are all the cz gurus  ??? or firko ;)

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Ji Gantor on February 08, 2009, 07:58:12 pm

These are the numbers stamped into the compliance plates.

I am not sure but this may be the answer.

In 1971 CZ gauged their engines by BHP break horse power.
In 1973 CZ gauged their motors by DIN HP.

Break horse power is measured at the fly wheel, while DIN is measured at the rear wheel.

Ji

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: paul on February 08, 2009, 08:23:27 pm

http://www.czmadness.net/specs/cz400.html

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Ji Gantor on February 08, 2009, 09:44:38 pm

Yes paul I have seen that to but CZ stamped 37 HP on the compliance plate of my 1973 400 while I have seen 42 hp stamped into a 1971 compliance plate.

Very Odd.

Ji

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Ji Gantor on February 14, 2009, 11:22:33 pm

Well what porting differences were there between the 1973 black frame and the 1974 red frame CZ400s.
I know the swingarm was modified and most likely the forks and shocks.

Ji

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: shortshifter on February 21, 2009, 07:08:02 pm

That czmadness site is insane!

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Ji Gantor on February 21, 2009, 09:55:46 pm

Hi shortshifter,
Yes that web site is very informative.

Ji

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: cloggy on April 17, 2009, 06:48:38 am

The Roger Decoster influenced RM400 had less peak power than the earlier RM370.
On the road the RD400 also had less peak power than the RD350
Both bigger bikes had wider torque bands and so were faster bikes on track and road

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Bamford#69 on April 17, 2009, 09:09:08 am

HI Ji
 CZ's have BRAKE horse power (BHP)
 Maico's have BREAK horse power
LOL

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Nathan S on April 18, 2009, 08:33:26 pm

My first thought is that they were probably being more "optimistic" for the earlier bike.

Ever seen the HP figures stamped into an old Datsun's factory ID plate? Ever been in a car that actually makes the HP that Datsun claimed their cars made?;)
Factories are not above optimistic claims to help sell stuff...

Title: Re: CZ380 71 42hp V CZ400 73 37hp
Post by: Oggy Doggy on April 18, 2009, 08:38:09 pm

No idea Ji, just Czech weirdness I guess. Welcome back by the way.