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Old 04-10-2021, 10:23 AM   #1
ShrunkenMonsters
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Default Need valve sizes/specs to cross reference.

I’m going to cross reference the sizes and specs to attempt to find some titanium valves from a Suzuki motorcycle to lower the valve weight and increase durability and possibly raise the rpm limit. Need the specs for both the intake and exhaust valves. Any help would be appreciated.
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Old 04-10-2021, 11:15 AM   #2
kgsc
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Default Re: Need valve sizes/specs to cross reference.

Which motor?
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Old 04-11-2021, 08:00 PM   #3
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Default Re: Need valve sizes/specs to cross reference.

Sorry about that, for an eh29c 96 model if that matters.
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Old 04-11-2021, 08:17 PM   #4
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Default Re: Need valve sizes/specs to cross reference.

Any gains in RPM would be lost unless you replace the ignitor. It has a built in rev limiter. There were ignitors made for one year, 1991 I think. Good luck finding one, and if you do, expect to pay a bunch. The other option is a HEI setup, but I've only heard of limited success using them. I know the later MCI models were supposed to have automatic adjustable timing as part of their performance enhancement to give better efficiency through the RPM range, but I know they don't work with pre-MCI engines, and also have a rev limiter built in.
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Old 04-12-2021, 11:32 AM   #5
ShrunkenMonsters
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Default Re: Need valve sizes/specs to cross reference.

I have already completed a HEI conversion, and it works great, but at around 5,500-6k I start to get valve float. Instead of going with stronger springs to handle the higher RPM (and add further strain to the valve train) I was going to lighten thes load for it. There’s extensive modifications coming in the near future (efi, vz21 intercooled turbo or amr300 supercharger, and possible a small Honda grom nitrous spray to spool the turbo if I go that route). I’m going to be doing quite a bit of weird stuff to it and I’m not horribly worried about the consequences or cost. It’s just a hobby that I do and rebuilding is part of the fun.
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Old 04-12-2021, 12:48 PM   #6
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Default Re: Need valve sizes/specs to cross reference.

Quote:
Originally Posted by ShrunkenMonsters View Post
I have already completed a HEI conversion, and it works great, but at around 5,500-6k I start to get valve float. Instead of going with stronger springs to handle the higher RPM (and add further strain to the valve train) I was going to lighten thes load for it. There’s extensive modifications coming in the near future (efi, vz21 intercooled turbo or amr300 supercharger, and possible a small Honda grom nitrous spray to spool the turbo if I go that route). I’m going to be doing quite a bit of weird stuff to it and I’m not horribly worried about the consequences or cost. It’s just a hobby that I do and rebuilding is part of the fun.
Awesome. Just sharing that the ignitor is a limiter with regard to RPM...some folks are not aware. Would love to follow along with the build. I'm sure a lot of folks would be interested in your HEI setup since it works. Ignitors have gotten prohibitively expensive and the HEI setup would help a bunch of folks out, not to mention the potential for RPM gains. As I recall, there was a guy out west that did a supercharger on one, actually built and sold the components to others until he passed away, and he used the stock rods/piston setup. Seems like they hold up well to the RPM torture...just the valvetrain that is suspect. Good luck with it.
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