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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › 91SZ PS-HYPER
02-09-2006 11:09 PM  12 years agoPost 21
MattUK

rrApprentice

Lancaster, UK

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Cheers DOKEY / Dr Lodge

Well I took the backplate off to have a sneak...Nice to see they have used rubber seal rather than those cr@ppy gaskets. Looking a the piston and liner....very different from the c-spec, the c-spec piston looks much more complicated in shape? the SZ is really basic.

Camera is comming out...

Matt.

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02-10-2006 12:01 AM  12 years agoPost 22
O-pinion

rrNovice

uk

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[quote]If you want improved performance you can get the Cline modification directly from Skyline which is a really well proven set up.

I thought the carburettor needs to be modified too,do they exchange it for your original or something?

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02-10-2006 12:03 AM  12 years agoPost 23
z11355

rrMaster

New England

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no, you send it in to them, they modify it and send it all back.

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02-10-2006 12:09 AM  12 years agoPost 24
O-pinion

rrNovice

uk

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So James O Neil must have told Bob Johnston exactly how to modify the carbs then,or Skyline forward it to him in the US

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02-10-2006 12:12 AM  12 years agoPost 25
z11355

rrMaster

New England

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I dont know how it's handled overseas.

I doubt there is an exchange program at the retail level but
you could of course just ring up bobj and ask

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02-10-2006 09:05 AM  12 years agoPost 26
DOKEY

rrProfessor

Northamptonshire UK

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Bob (Skylines) should have the modded carb with cline reg in stock next week.

Your carb, modded is around £70.
New Carb and mod, supplied is around £200.

Ryan.

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02-10-2006 11:40 AM  12 years agoPost 27
bigglesbutler

rrVeteran

Aberdeen, Scotland

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MatthewUK asked a good question, and one I would ask anyway as my two SZ are winging their way to me. With 30% any ideas which head shims to use?
Any help before my engines arrive would be much appreciated.
Thanks in advance

Si

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02-10-2006 11:46 AM  12 years agoPost 28
DOKEY

rrProfessor

Northamptonshire UK

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As it comes, thats how mine is so far.

Ryan.

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02-10-2006 10:08 PM  12 years agoPost 29
MattUK

rrApprentice

Lancaster, UK

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A few snaps of the SZ and C-spec guts

Anyone know if the exhaust timing is the same as the c-spec ?

Matt.

----
Light travels faster than sound. That's why some people appear bright until they speak.

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02-16-2006 09:16 AM  12 years agoPost 30
Jafa

rrElite Veteran

Sydney, Australia

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The bore and stroke are different, the exhaust duration was rumoured to have been changed, but hard to see it looking at your photo.

The SZ head may have a recess as the top of the SZ liner is much higher

Interesting...


Protos | Logo 400 & 500 | Sceadu Evo | Freya Evo | Trex600N | Avant FX

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02-16-2006 08:19 PM  12 years agoPost 31
robhurlin

rrKey Veteran

Pretoria, South Africa

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Hey Matt - why not try it without the pump first! I bet you will be happy! BTW, what pump are you using? It will be interesteing to see how quickly OS bring out a conversion kit for the standard SZ - I would rather use theirs since the pump system in the SZ looks different to the one on the C-spec.

Rob.

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02-16-2006 09:31 PM  12 years agoPost 32
MattUK

rrApprentice

Lancaster, UK

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Rob,

Well from what everyone is saying I dont really need the pump But I have already tapped the back plate anyway so I will try WITH and WITHOUT. Well it must be of some benefit because curtis is/was using the perry with the SZ?.

I will be using the Perry Pump that was used on my C-Spec.

Matt.

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02-20-2006 02:59 PM  12 years agoPost 33
ChristianM

rrVeteran

Oslo, Norway

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Hi

I just got my OS 91 SZ that I will be using in my Revolution (see my gallery). I will be pressurizing the tank from the crankcase pressure and using a YS check valve. Also I will be regulating the fuel with the Iron Bay Regulator:

The fuel delivery system will be just like on the YS which in my opinion is very simple and built proof. It only $44 so it is a lot cheaper than some of the other solutions I have seen out there.

Question: Does anyone have any experience or recommendation on which combination of shims to use with 30% and 20% nitro fuel and while breaking it in?

Christian

Burn fuel, be happy

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02-20-2006 05:15 PM  12 years agoPost 34
sookainian

rrApprentice

Singapore

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Since there is a OS91SZ with pump coming out, is there a upgrade KIT from OS which we can upgrade the non pump, OS91SZ, to the new OS91SZ with pump ? issit mroe expensive ?

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02-23-2006 03:11 PM  12 years agoPost 35
Chopper

rrKey Veteran

Stow,Oh- oops, I mean St Louis, nope Stow again,

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That is it! The Iron Bay regulator looks like the exact thing I have needed. I will give them a call.

The single biggest problem that I have with the OS is engine rust. The engine rust comes from the acid generated by the exhaust. This will solve that problem, and hopefully a few more.


Thanks.

Paul Soha is a free agent now. Wow.

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02-26-2006 01:54 AM  12 years agoPost 36
Oat

rrVeteran

CA

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Do you need to do any mod to this engine?

Insane Canopy | Kasama | Kontronik | Jeti

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02-26-2006 08:04 AM  12 years agoPost 37
DOKEY

rrProfessor

Northamptonshire UK

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Do you need to do any mod to this engine?
NO nothing at all needs to be done, fly it out of the box.

Ryan.

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02-26-2006 03:39 PM  12 years agoPost 38
Oat

rrVeteran

CA

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Cool, will be my next engine on the Stratus.

Thanks,

Insane Canopy | Kasama | Kontronik | Jeti

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02-26-2006 10:26 PM  12 years agoPost 39
bl8zn

rrVeteran

New Jersey

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Hey ChristianM...let us knbow how that Iron Bay works out...would be interesting to see if it works...

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02-27-2006 03:13 PM  12 years agoPost 40
ChristianM

rrVeteran

Oslo, Norway

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I was out at the field yesterday and put the first tank of fuel through the engine and the regulator worked as advertised. I only did a bit of hovering while breaking it in so I do not know for certain how it will work when I give the heli a work out. However, I first saw it in Model Helicopter World (two or three months ago) in an article that discussed pumped fuel systems and a top Japanese 3D pilot was using it on the 91 SZ so I expect it to work flawlessly.

Edit: The Iron Bay regulator comes with a pressure nipple that can be used on the crank case, but I was not very happy with it so I order the nipple that comes with the Perry pump. This fit perfectly but you need a 3.5mm tap to install it in the crank case cover.

Christian

Burn fuel, be happy

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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › 91SZ PS-HYPER
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