[Healeys] Compression ratio for a fast road 100----Update

[Derek Job]

Thomas

Congratulations on building a very nice engine.

I was talking to the mechanic that looks after 2, 100s that race at Le Mans
and Goodwood. They have full blown race engines with steels cranks etc,
etc. He had just got back from dyno testing and recorded 141 hp at the
wheels which they feel is about the maximum you can extract from the 100
engine

regards

Derek
www.healeysix.net

On Sat, Apr 21, 2012 at 9:44 AM, T+ B Willig <willig at wtnet.de> wrote:

> Hi,
>
> I have finished building up the motor to the specs described below. The
> results are:
>
> Smooth running
> Very usable power curve
> No running on
>
> The car was tested today on a rolling road and  82 kW (110 hp) was measured
> at the rear wheels at 4800rpm. I'am delighted!
>
> Best regards
>
>
> Thomas Willig
>
> --------------------------
>
> First of all thanks for the big number of replys to my question. To
> clarify my plans:
>
>
>
> I plan to use:
>
>
>
> DW Fast road aluminum head with hardened studs and DW competition head
> gasket.
>
> 100S profile camshaft 228/234
>
> 10.5:1 DW pistons turned/dished to give 9.5:1 CR
>
> Harmonic damper on crankshaft
>
> Narrow fan belt conversion
>
> Lightened original flywheel
>
> All components precision balanced
>
> Con rods equalized
>
> SU H6 on 100 M Manifold
>
> 123 Ignition
>
> Regards
>
> Thomas Willig
>
>
> Von: David Nock [mailto:healeydoc at sbcglobal.net]
> Gesendet: Donnerstag, 13. Januar 2011 17:30
> An: Thomas Willig
> Cc: healeys at autox.team.net
> Betreff: Re: [Healeys] Compression ratio for a fast road 100
>
> Be very careful when raising the compressions on a 100/4. We just
> finished re doing a 100 M that had 13:1 flat top pistons in it the
> engine would run on and ping so bad on street gas that you could not
> drive it. Also due to the high compressions it cracked that crankshaft.
>
> DW only shows a 8.5:1 and 10.5:1.  I would say that with the 10.5:1
> option you will have to be very selective on fuel and possibly be
> limited to race fuel.
>
> When we are building a performance motor for the street we will use the
> 8.5:1 pistons with a good performance camshaft, New lightened flywheel
> and an aluminium head with hardened studs and special head gasket that
> does not LEAK. We also will use a verneer cam gear to adjust the cam
> timing to the optimum performance.
>
> We have installed lots of light flywheels on both 4 and 6 cylinder cars.
> As low as 15 lbs and had no problems with idle, accleration or any other
> of the things that have been mentioned on previous e mails.
>
> David Nock
>
> British Car Specialists
>
> Stockton Ca 95205
>
> 209-948-8767
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