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AndrysPosthuma
Netherlands
168 Posts |
 Posted - 29/04/2017 : 17:33:05
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(EDIT: title was wrong)
Hi all,
My N-type has two HV2 carbs. One of them has an aluminium piston, the other has a brass piston. I would like to trade the aluminium one (plus dome) for a brass piston + dome. The aluminium had a closed top, the brass one is open.
Anyone interested?
Thanks, regards, Andrys |
Edited by - AndrysPosthuma on 30/04/2017 14:44:33 |
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Simon Johnston
United Kingdom
6015 Posts |
Posted - 30/04/2017 : 08:39:13
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Andrys
The HV2 carb is 1 1/8" not 1 1/4" and almost certainly had alloy pistons, not brass. They should weigh around 155/165 grams according to a small survey I did a couple of years ago.
Simon J
J3437 |
Edited by - Simon Johnston on 30/04/2017 14:00:44 |
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AndrysPosthuma
Netherlands
168 Posts |
Posted - 30/04/2017 : 14:48:42
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Hi Simon, thank you for your reply. You are right, the carb size is 1.1/8" and I corrected the title of this topic.
Attached a photo of what I have. The brass one weighs 240 grams, the alu 163 grams.
Anyone wanting to sell or trade a second brass one?
Thanks, Andrys |
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Simon Johnston
United Kingdom
6015 Posts |
Posted - 30/04/2017 : 15:55:23
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It's another alloy one you want, Andrys. The brass one is way too heavy and is from a later carb with the oil damper - hence the hole in it.
Simon J
J3437 |
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sven
Sweden
425 Posts |
Posted - 30/04/2017 : 17:06:34
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Andrys
I second Simons opinions. The brass piston is too heavy and will not allow the piston to rise suffciently for full power. Your aluminium one is correct. Beware - there are many aluminium ones with different weights.
Good luck
Sven
L types |
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Drolshagen
Germany
663 Posts |
Posted - 30/04/2017 : 18:32:34
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Sven,
sorry my original 1 1/8 piston has no hole for a damper
Carl
J2 4362
L2 2036 |
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Simon Johnston
United Kingdom
6015 Posts |
Posted - 30/04/2017 : 19:36:19
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There shouldn't be holes for the damper on any Triple-M car. The damper didn't come into production until after Triple-M production ceased.
Simon J
J3437 |
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AndrysPosthuma
Netherlands
168 Posts |
Posted - 30/04/2017 : 19:41:37
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Thanks a lot for the responses. (Obviously) a newbie here, learning something new every day  . Your patience is much appreciated.
So there I go: who has an aluminium piston plus dome without a hole for sale/trade? |
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Simon Johnston
United Kingdom
6015 Posts |
Posted - 30/04/2017 : 19:45:30
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Don't forget, Andrys, that you want a 'matched pair', i.e. both pistons the same weight. In my small survey, N Type pistons were in fact 155 grams, so at the very light end of the scale. I suspect that two at 163/165 would work OK however.
Simon J
J3437 |
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Blue M
United Kingdom
1461 Posts |
Posted - 03/05/2017 : 21:25:01
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| The one on the left is not aluminium, it's Mazak metal which is much heavier. Aluminium ones have an iron ring in the top and are a lot more common. In my experience finding two Mazak ones the same weight is next to impossible. It might be frowned upon by purists but light non-weighted pistons with matched springs work well though they might need the dampers with them. |
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