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Discussion Starter #1
Has anyone got the dimensions of the standard Honda OEM clutch for the 5th gen Prelude? Has anyone got one laying around (new or used)?
 

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what are you tryin to do?
 

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Discussion Starter #3
I want to compare it to the 4th gen Prelude clutch. In the UK, they are slightly different, but not sure about the rest of the world. The Honda part numbers are different and so are the Exedy part numbers.
 

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I have one sitting in my garage, what dimensions do you need and do you want them in metric or inches?
 

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Discussion Starter #5
I have one sitting in my garage, what dimensions do you need and do you want them in metric or inches?
Thanks for that.

I would like the total diameter of the whole disc, the diameter of the gap in the middle and the width of the friction area of the clutch disc. In CM/MM please.
 

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total diameter: 22cm
friction surface width: 3cm
diameter of the input shaft hole: 2.5cm
 

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Discussion Starter #7
total diameter: 22cm
friction surface width: 3cm
diameter of the input shaft hole: 2.5cm
You are a star, thank you very much.

I'll compare the measurements tomorrow before announcing my findings (it's way past my bed time right now).
 

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In the rest of the world, 4th gen and 5th gen clutches are interchangeable, they work for both generations. My exedy listed as 92-01 and so did the flywheel. Not sure why there are different part numbers *shrugs*

In my 5 speed swap I used a 4th gen transmission on a 5th gen (stock H22A4 engine), "92-01" Exedy clutch and "92-01" Exedy flywheel. no issues here!
 

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Discussion Starter #12 (Edited)
Right, I've compared both 4G and 5G clutches. The 4G clutch I have in my possession is manufactured by Exedy (disk = HCD015U & cover = HCC908). The 5G clutch I have in my possession is manufactured by Aisin. As stated above, the 4G and 5G clutches are interchangeable, however their part numbers do differ (including Exedy part numbers and Honda part numbers). I have spoken to Exedy UK and they have confirmed that the manufacture of their specific 5G clutch kit is outsourced to Aisin, so if you order a 5G specific clutch kit, you will get an Aisin manufactured clutch (in the UK at least). They told me that Aisin send the parts to Exedy in brown boxes then Exedy repackages them in Exedy boxes. The Exedy 5G clutch set (HCK2034) consists of disc = HCD303, cover HCC706 and a release bearing (which I haven't compared). I explained to Exedy that 4G and 5G clutches are interchangeable and they said that there must be a difference because if there was not, Exedy would have rationalised the Prelude range of clutches, which I suppose makes sense.

Anyway, here are the measurements (in CM & KG):

Code:
                 Diameter:  Surface area:  Thickness:  Weight:
Exedy 4G Disc    21.8       3.1            0.8         1.0
Aisin 5G Disc    21.2       3.1            0.8         1.1

Exedy 4G Cover   22.5       3.8            ?           4.7
Aisin 5G Cover   22.4       3.7            ?           5.3
You can see that there is not a lot of difference. The surface area of the friction material is 3.1 cm on both, however, the 4G clutch has a larger diameter, therefore the surface area of the friction material covers a wider area. Another interesting point is with the weight difference. Clearly, the lighter 4G clutch has a performance advantage over the heavier 5G clutch. Also, when comparing the two, I get the impression that the Exedy branded 4G clutch does look like a better quality finished product that the Aisin 5G clutch.

I should also point out that the Exedy clutch is marked as Exedy on the parts themselves, along with their part numbers. However, the Aisin clutch has no markings and I did not purchase the 5G Aisin clutch set from a very reputable retailer, so there is a slight possibility that it might not actually be an Aisin clutch. It could be any clutch in an Aisin box and I wouldn't know (I'm in the process of claiming a refund).

Coincidently, the Fidanza 8 lb flywheel is actually 8.4 lb / 3.8 kg to be more exact.

My clutch is due to be replaced next week along with the fitting of my new Fidanza flywheel. I will get the Exedy 4G clutch fitted rather than the inferior (in my opinion) Aisin 5G clutch. I'll ask for the workshop to return the old parts and I will measure them.
 

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Discussion Starter #13
Here is the updated comparison table with original Honda OE 5G clutch and more precise weights for the clutch discs. I've deleted the thickness column 'cos they were the same.

Code:
                   Diameter:  Surface area:  Weight:
Exedy 4G Disc      21.8       3.1            1.056
Aisin 5G Disc      21.2       3.1            1.157
Honda OE 5G Disc   21.2       3.1            1.167

Exedy 4G Cover     22.5       3.8            4.7
Aisin 5G Cover     22.4       3.7            5.3
Honda OE 5G Cover  22.6       3.9            5.1
Also, FYI, the Fidanza "8lb" aluminium flywheel actually weighs 8.4lb (3.8 kg) whereas the original Honda OE 5G flywheel weighs a hefty 18.3 lb (8.3 kg).
 

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Hi Prelude UK,

Great respect to through research. I'm in the same situation as you where in March . I agree Exedy UK has different part numbers to Exedy usa.Did the 4th gen exedy clutch kit fit to your 5th Prelude gearbox without drama ? If so, I gonna buy the 4th generation Exedy clutch !
 

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Discussion Starter #15 (Edited)
Hi Juju,

As far as I know, there were no issues with the fitting of the clutch and after approx 1150 miles I haven't had any problems so there is nothing to stop me recommending the 4G Exedy clutch kit (I also recommend you get a Fidanza flywheel at the same time, you won't regret it).

In January, I bought my 4G Prelude Exedy Clutch kit from these people - Tegiwa Imports - Japanese Car Import Specialists. I phoned them before 14:00 and it was delivered the following day and cost a total of £140.
 

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4g 5g clutch

Hi Juju,

As far as I know, there were no issues with the fitting of the clutch and after approx 1150 miles I haven't had any problems so there is nothing to stop me recommending the 4G Exedy clutch kit (I also recommend you get a Fidanza flywheel at the same time, you won't regret it).

In January, I bought my 4G Prelude Exedy Clutch kit from these people - Tegiwa Imports - Japanese Car Import Specialists. I phoned them before 14:00 and it was delivered the following day and cost a total of £140.
hi - so will the 4g clutch definitely fit a 5g (97) UK model? I am looking at HONDA PRELUDE 2.0 2.2 2.3 VTEC 92-ON EXEDY CLUTCH KIT 3 PCE HCK2029 | eBay for my 97 5g...

thanks
 
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