Lower Pressure Radiator Cap Needed - Honda Motorcycles - FireBlades.org
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post #1 of 12 Old 08-26-2006, 2:25 PM Thread Starter
 
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Lower Pressure Radiator Cap Needed

Does anyone know where I can find a lower pressure radiator cap for a 02 954?

The stock cap is a 1.1 Bar (15 PSI) cap and that is way more pressure then I need for my set up.

I am looking for something around 6-7 PSI (or .5 Bar) cap that will fit on a stock 954 Radiator.

I have already searched with no luck.

Is there a bike cap or a car cap that will work? Do the radiator caps interchange with any of Honda's automotive models or are they motorcycle specific.

Thanks for the help.

Gigolo Jason
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post #2 of 12 Old 08-26-2006, 2:40 PM
 
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Re: Lower Pressure Radiator Cap Needed

Just curious .... why would you need a lower pressure cap? Is there some performance gain?
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post #3 of 12 Old 08-26-2006, 2:53 PM Thread Starter
 
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Re: Lower Pressure Radiator Cap Needed

Propylene Glycol

H2O free coolant systems do not like high pressure radiator caps.

They like low pressure or no pressure caps.

And yes, there is a performance gain with a coolant boiling point of 370F degrees campaired to 212F with water.

Help me find the cap and I will do a full write up with pictures so that everyone else can do it to their Fireblade and not have to worry about over heating or coolant changes ever again.

Last edited by Gigolo Jason; 08-26-2006 at 2:59 PM.
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post #4 of 12 Old 08-26-2006, 3:36 PM
 
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Re: Lower Pressure Radiator Cap Needed

car radiator caps are a cap with a seal pushed down by a spring. The spring determines how much pressure it relieves at. My next guess would be cut the spring?

Never seen a fireblade radiator cap myself.
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post #5 of 12 Old 08-26-2006, 3:39 PM
 
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Re: Lower Pressure Radiator Cap Needed

I see Amsoil makes a propylene glycol antifreeze that you only have to change every 7 years. Is Engine Ice also propylene gycol? They are environmentally friendly and not toxic like ethylene glycol, a good thing.

Interesting, but I'd still have to change it more frequently, as the propylene glycol, as far as I know, still isn't allowed at trackdays requiring antifreeze removal...
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post #6 of 12 Old 08-26-2006, 4:32 PM Thread Starter
 
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Re: Lower Pressure Radiator Cap Needed

Thanks but I am not looking to cut a spring. I am looking for a cap specifically designd for a lower pressure.

Yes, Engine Ice's main ingredient is propylene glycol and Evans is 100% propylene glycol. 100% propylene glycol coolant systems do not use water and do not boil in engines, thus utelizing a lower pressure cap.

I have had success with this on rotaries and have run it at SCCA events.

It is legal in the AMA and the CCS.


Does anyone know where I can find a lower pressure cap? Help me help bikes.

Last edited by Gigolo Jason; 08-26-2006 at 4:42 PM.
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post #7 of 12 Old 08-26-2006, 5:45 PM
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Re: Lower Pressure Radiator Cap Needed

Am I thinking backwards, or doesen't this mean you will need a larger radiator to keep the bike running at a saner temp?

why put off today what you can wake up late and forget to do tomorrow.

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post #8 of 12 Old 08-26-2006, 6:04 PM Thread Starter
 
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Re: Lower Pressure Radiator Cap Needed

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Originally Posted by SomeStrangeGuy View Post
Am I thinking backwards, or doesen't this mean you will need a larger radiator to keep the bike running at a saner temp?
Thinking backwards, you said it not me.

No, the radiator stays the same. What this does is rase the boiling temperature and changes the expansion rate of the coolant.

If a machines coolant system is designed for a water based coolant with a boiling point of 212F then it will be over designed for a propylene glycol based system.

This isn't rocket science, this is used in race cars and hot rods all the time, the only thing that needs to be changed is the radiator cap.

What I need is a lower pressure cap for a 02 954
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post #9 of 12 Old 08-26-2006, 7:00 PM
 
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Re: Lower Pressure Radiator Cap Needed

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Originally Posted by Gigolo Jason View Post
This isn't rocket science, this is used in race cars and hot rods all the time, the only thing that needs to be changed is the radiator cap.

What I need is a lower pressure cap for a 02 954
When you answer questions like that, you shouldn't expect much of an answer to your own. However, I'm a nice guy so I'll provide you with some info as I've been looking into this also.

Should you choose the low/zero pressure cap route:

Evans NPG+ Waterless Coolant - ADVrider
Quote:
What you can do is go to a zero pressure system. This is done by drilling the rivet out of the center of the underside of the rad cap
Should you choose to follow the manufacturer's guidance:

From Evans Cooling Site (Evans Cooling Systems - High Performance Engine Cooling and Power Production.) FAQs:
Quote:
You may use your standard radiator pressure cap. In fact, we recommend a 7lb cap to keep NPG+ from absorbing water from the atmosphere. Some users found they could smell coolant, again a 7lb cap eliminated the issue. NPG+ will still cool your system with industry leading efficiency. Of course if you'd like to run a low pressure or even zero pressure system, you will need to purchase a low pressure cap or modify your existing cap. Please consult our tech pages or instruction guide (or call us) before modifying your existing cap!
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post #10 of 12 Old 08-26-2006, 7:23 PM Thread Starter
 
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Re: Lower Pressure Radiator Cap Needed

Thank you Seamus, good links, but I have seen both of those before.

I promise that this isn't my first date to the dance with this stuff.

What I am asking, and no one has yet been able to give me an answer, is is there an off-the-shelf lower then stock pressure radiator cap for the 954?
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post #11 of 12 Old 08-26-2006, 9:12 PM
 
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Re: Lower Pressure Radiator Cap Needed

From everything I've seen, everyone is either running the stock cap or modifying it by cutting/removing the spring or drilling the rivet.

I haven't seen a low pressure cap for any motorcycle. Found some for trucks/cars but the cap on the blade is smaller than those.
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post #12 of 12 Old 08-26-2006, 9:33 PM
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Re: Lower Pressure Radiator Cap Needed

Quote:
Originally Posted by Gigolo Jason View Post
Thinking backwards, you said it not me.

No, the radiator stays the same. What this does is rase the boiling temperature and changes the expansion rate of the coolant.

If a machines coolant system is designed for a water based coolant with a boiling point of 212F then it will be over designed for a propylene glycol based system.

This isn't rocket science, this is used in race cars and hot rods all the time, the only thing that needs to be changed is the radiator cap.

What I need is a lower pressure cap for a 02 954
Ahh, I thought I had it backwards. I was trying to remember why we had to size the coils larger if using glycol and it was to maintain supply temp. Your goal is to to use this to your benefit, so it makes sense.

Im familiar with the concept, just haven't worked with it in a looong time. Good luck in your quest for a cap. I am doubtful though unless there is an HRC model.


The HRC thing was a joke

why put off today what you can wake up late and forget to do tomorrow.

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