[Bulk] Re: [Bulk] [Diy_efi] Steve Ravat, CX 500 EFI?

[Ernest Buckler]

Steve,
6x6x2 is very similar to OEM case on the CX 500 Turbo.  Yup, same 80? V-twin 
with two ign. triggers. Way oversquare, 4-valve heads, pushrods, but very 
short, so redline is still 10K.  CR for carb versions is 10:1, turbos are 
8:1.  Very strong engines - with one weak link, the alternators are buried 
in the rear case thus overheat and fail about 30K miles, require total 
engine removal for access (ign. triggers are also in there).  I don't like 
the OEM wastegate, either, as extended sitting can cause a non-serviceable 
flapper shaft to seize.  It's a common style, with overpressure causing a 
flap at the header ex. flange to open.  I'm interested in a small "tower" 
(?) type if you know of such a thing.  Honda no longer supports these, so we 
owners are on our own. Plus factory sensors run $200-$300 and up - and there 
are 7 of them.
Ernie




----- Original Message ----- 
From: "Steven P. Donegan" <donegan at donegan.org>
To: <diy_efi at diy-efi.org>
Sent: Friday, January 05, 2007 9:00 AM
Subject: Re: [Bulk] Re: [Bulk] [Diy_efi] Steve Ravat, CX 500 EFI?


> At the moment all I've done is the input board - which ends up being
> about 2.9x2.3 inches the CPU board is about that size - so total real
> estate at the moment is roughly 2.5x6 inches - I expect the output
> driver boards to be like 1x6 each - so a rough guess right now would
> make the overall dimensions in the 5x6 or perhaps 6x6 range - and other
> than case/heat sinks etc I would expect no more than 1 inch deep - so
> worts case figure 2 inches deep by 6 inches square, not huge but not
> tiny either. For space constrained applications I could do the design in
> surface mount but that would mean it gets fabbed 100% by a vendor and
> that probably means cost...
>
> If I do a version of this just for motorcycles I can goal seek for small
> size - my current goal is to fit my Z28 Camaro (1998) and my 1985
> Mustang (B&M supercharged carb'd engine at the moment - and carb is
> really crummy for that application). If I do a bike version it will be
> with the goal to fit exactly where my EFI computer fits now on my 2004
> Dyna...
>
> Is the CX 500 the Honda V-Twin of old?
>
> On Fri, 2007-01-05 at 07:27 -0800, Ernest Buckler wrote:
>> Steve,
>> Any estimate for overall dims of the final package?  OEM box on these
>> machines is not tiny, and there's more room under the tailpiece.
>> Ernest
>>
>>
>> > Although what I'm designing is intended to be 'universal' it may be a
>> > tad large (physical size) for a bike. I do intend to play with it on my
>> > Harley at some point but it is primarily intended for V8 applications.
>> > If size does become an issue I could shift some or all of it to surface
>> > mount - the down side is that would effectively take it out of hobby
>> > land as most folks are not going to have the tools to do surface mount
>> > stuff at home...
>> >
>> > On Thu, 2007-01-04 at 23:22 -0800, Ernest Buckler wrote:
>> >> Steve,
>> >> Lost your direct email, so a question here: Any further work being 
>> >> done
>> >> that you might know of for replacement EFI for the CX turbos?
>>
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