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 H120/ Holbay Replica
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jabe1807

Norway
182 Posts

Posted - 15 Nov 2011 :  19:51:29  Show Profile  Reply with Quote
Hi. Here are som pictures from building my Holbay replica engine.
http://i1089.photobucket.com/albums/i349/jabe1807/P10102112.jpg, ,

Edited by - jabe1807 on 23 Dec 2011 22:03:19

janmarine3

South Africa
286 Posts

Posted - 16 Nov 2011 :  04:39:19  Show Profile  Reply with Quote
wow ! cool....what exhaust system are you going to use and will you use an oil cooler ?
Jannie.
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1922

United Kingdom
547 Posts

Posted - 16 Nov 2011 :  20:14:19  Show Profile  Visit 1922's Homepage  Reply with Quote
Interesting combustion chambers, and are those inlet ports larger than normal?

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jabe1807

Norway
182 Posts

Posted - 16 Nov 2011 :  20:55:15  Show Profile  Reply with Quote
I will use the orginal Holbay exhaust (4-2-1). Have no oil cooler. I dont think H120 had one.
Are the combustion chambers different from holbay? I dont know if the inlet are bigger than orginal. What is the orginal diametre?
My inlet manifoid have smaller diametre than the head. Hope it will be correct combination.
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JPSH120

United Kingdom
1035 Posts

Posted - 16 Nov 2011 :  21:18:54  Show Profile  Reply with Quote
This is a normal Holbay head;



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janmarine3

South Africa
286 Posts

Posted - 17 Nov 2011 :  18:14:43  Show Profile  Reply with Quote
The cam should also tell a story... are you going to install a standard Holbay cam or do you know what cam comes with that head ?
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1922

United Kingdom
547 Posts

Posted - 17 Nov 2011 :  20:28:47  Show Profile  Visit 1922's Homepage  Reply with Quote
I don't know the diameter of the standard Holbay inlets ports - but I remember that they were much smaller than holes in the gasket. I think they matched the inlet manifold.

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jabe1807

Norway
182 Posts

Posted - 18 Nov 2011 :  20:46:42  Show Profile  Reply with Quote
The inlet on my head is 33 mm diametre, the same as on a standard 1725 head. Manifoild is 27 mm.
My head is bought as a Holbay head, number 7437. Is it possible that my head is from an early production and therefore it is that big diametre?
I will measure the volum of the combustion chambers to see if there are any different from Holbay. I think the volum should be 29 cc (I will check that, I have correct volum somewhere).
I have bought a (nos) Holbay camshaft from UK. Hope I have got a correct one.

Edited by - jabe1807 on 18 Nov 2011 20:48:04
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1922

United Kingdom
547 Posts

Posted - 18 Nov 2011 :  21:05:57  Show Profile  Visit 1922's Homepage  Reply with Quote
I think I remember someone posting on here that the Holbay ports are smaller than the standard - hopefully JSPH120 has his ruler handy


Edited by - 1922 on 18 Nov 2011 21:06:57
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Paul

United Kingdom
60 Posts

Posted - 19 Nov 2011 :  02:08:55  Show Profile  Reply with Quote
Absolutely right. The Holbay manifold won't mate directly with a standard head because the Holbay port sizes are smaller but there is a Deronico manifold which fits a standard upright head (Audax cars) and takes the twin 40DCOE carbs.

My Alpine won't float! I need one which does!!
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1922

United Kingdom
547 Posts

Posted - 19 Nov 2011 :  19:24:21  Show Profile  Visit 1922's Homepage  Reply with Quote
You could have a modified Holbay head. Holbay used to offer a 122bhp "Rally" engine that had enlarged inlet ports, and a 1840cc 130bhp "Marathon" engine with enlarged ports, larger combustion chambers and larger bores. I've seen several modified heads that looked like yours, some started as Holbay heads and some as standard heads.

Don't be concerned about the smaller manifold - this should increase the gas speed and improve mid-range power. Ford 351 Cleveland v8 engines are often fitted with an inlet manifold that is smaller than the inlet ports for this exact reason.

For a 1725 engine with a standard Holbay cam I would use the standard Holbay manifold. If you plan to use a higher lift cam (like the Holbay E128) then it would be worth enlarging the inlet manifold ports to match the head.


Edited by - 1922 on 19 Nov 2011 19:29:20
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jabe1807

Norway
182 Posts

Posted - 07 Dec 2011 :  21:52:05  Show Profile  Reply with Quote
I just had to put on the webers
and the exhaust to take a picture

I have measured the combustion chambers
and the volums are between 45,0 ccm and 45,5 ccm.
I think Holbay has 43 ccm.
So maybe my head is modified?
The head is nr 7437,
is that nr telling something?


Edited by - jabe1807 on 07 Dec 2011 21:55:03
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JPSH120

United Kingdom
1035 Posts

Posted - 07 Dec 2011 :  22:17:51  Show Profile  Reply with Quote
Looking good. That exhaust manifold looks new, where did you manage to find that?!

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jabe1807

Norway
182 Posts

Posted - 21 Dec 2011 :  21:38:40  Show Profile  Reply with Quote
Here are some new pictures from my Fastback work last weeks.
I have painted the engine room again. The first painting was not ok.
I have put in some parts on the car and started making new carpets. this was much more difficult than i thought before I started.

Edited by - jabe1807 on 21 Dec 2011 21:47:00
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jabe1807

Norway
182 Posts

Posted - 21 Dec 2011 :  21:45:19  Show Profile  Reply with Quote
Picture of carpet making


http://s1089.photobucket.com/albums/i349/jabe1807/Montering/

Edited by - jabe1807 on 21 Dec 2011 21:53:04
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jabe1807

Norway
182 Posts

Posted - 21 Dec 2011 :  21:49:24  Show Profile  Reply with Quote
quote:
Originally posted by JPSH120

Looking good. That exhaust manifold looks new, where did you manage to find that?!
Hi
I have bought it on ebay. It is not new, The seller has painted it.
Regards Jan

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