ACT HDSS Install - Pressure Plate Springs OK? - LotusTalk - The Lotus Cars Community
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post #1 of 8 (permalink) Old 01-30-2019, 07:38 AM Thread Starter
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ACT HDSS Install - Pressure Plate Springs OK?

A few days ago, I finished installation of a new ACT HDSS clutch on my 2005 Elise. Here's a shot of the final assembly bolted to the flywheel with all bolts tightened to ACT's recommend specs. Yes, the clutch disk is centered to the crankshaft pilot bore.

Question. Are the pressure plate springs supposed to form a flat plane? I was thinking they all might bow out a little bit once tightened down. However, I don't have any prior experience installing clutches as a reference.

I'm imagining the throwout bearing pressing against the springs, and there sure isn't a lot of room for them to move.

Someone please say I'm being a worry wort!!!


2005 Lotus Elise, naturally aspirated and always at redline!
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post #2 of 8 (permalink) Old 01-30-2019, 07:46 AM
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Before you tightened down the pressure plate, was it sitting about 1/4" off the flywheel? ...about the thickness of the clutch disc? If so, you're probably good.
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post #3 of 8 (permalink) Old 01-30-2019, 08:09 AM Thread Starter
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Originally Posted by glagola1 View Post
Before you tightened down the pressure plate, was it sitting about 1/4" off the flywheel? ...about the thickness of the clutch disc? If so, you're probably good.
Yes, I'm guessing 1/4" gap between the pressure plate housing after I got the six bolts finger tight.

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post #4 of 8 (permalink) Old 01-30-2019, 08:24 AM
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Boy I remember doing that!

Sure feels good when that transmission is back in place and you can put motor mounts back in and put the jackstand madness away under there.

Your on the downward slope getting it back together!


Do you have a lightweight flywheel? Boy if not now would be the minute... It def helps the car spin more freely and rev match too.


congratulations man.

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post #5 of 8 (permalink) Old 01-30-2019, 08:53 AM Thread Starter
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Originally Posted by Motard View Post
Boy I remember doing that!

Sure feels good when that transmission is back in place and you can put motor mounts back in and put the jackstand madness away under there.

Your on the downward slope getting it back together!


Do you have a lightweight flywheel? Boy if not now would be the minute... It def helps the car spin more freely and rev match too.


congratulations man.
I opted to not install a lightweight flywheel, mostly due to budget, and I've honestly never thought rev matching was that tough in this car. Spent my money on Penske's and upgrading a few things in the trans.
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post #6 of 8 (permalink) Old 01-30-2019, 11:08 AM
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I don't have an ACT, but can say that my stock clutch and the exedy I installed, looking at the pp springs from the side, looks more like a mountain than flat.

Having said that, I don't remember noticing and change in PP spring profile between sitting in my lap and installed on the transmission.

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post #7 of 8 (permalink) Old 01-30-2019, 05:33 PM
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Here is a picture of the install instructions from the Exedy that I installed last year.
The diagram in the lower right answers your question.

Attachment 1223830
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post #8 of 8 (permalink) Old 01-31-2019, 02:22 AM Thread Starter
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Cool, this helps give me some peace of mind!

2005 Lotus Elise, naturally aspirated and always at redline!
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