[DeTomaso] An engine-bay shot from Japan

[John Taphorn]

Uh oh - when the FI Meisters question my comments, I know to turn tail and 
run.

Yes, I propose that opinion because the engine is at wide open throttle and 
copious amounts of fuel appears to be exiting the runners.  That led me to 
hypothesize that the gaseous mass in reversion up the runner was picking up 
fuel being offered by the injector on a stroke other than the intake.  This 
led me to believe the duty cycle was longer than necessary and quite 
possibly 100%.

Although, when it comes to FI, I respectfully submit to you Obi Won.

JT


----- Original Message ----- 
From: "Kirby Schrader" <kirby.schrader at gmail.com>
To: "John Taphorn" <jtaphorn at kingwoodcable.com>
Cc: "DeTomaso Forum" <detomaso at realbig.com>
Sent: Tuesday, May 11, 2010 9:59 PM
Subject: Re: [DeTomaso] An engine-bay shot from Japan



OK, John... you gotta' splain that one to me...
Why do you propose that because you see the reversion effect, the injectors 
are at 100%?

If, in fact, the injectors are at 100%, he's got a really poor design, in my 
opinion. The injectors would be too small.

Those are pretty short stacks... much like IDA's.... and that would explain 
the reversion at high rpm.

But, I could be wrong....

Kirby




On 11 May 2010, at 8:56 PM, John Taphorn wrote:

> I am also surprised. I would guess that the EFI injectors are at 100% duty
> cycle and raw fuel is being pushed out on the exhaust stroke due to 
> overlap.
> That is a terrific sounding engine
>
> JT
> ----- Original Message ----- 
> From: "Dave Londry" <davel at emspace.com>
> To: "DeTomaso Forum" <detomaso at realbig.com>
> Sent: Tuesday, May 11, 2010 1:27 PM
> Subject: [DeTomaso] An engine-bay shot from Japan
>
>
>> http://youtube.com/watch?v=4eq5txuqRx4
>> This is a road-shot of a 351C with an IR - EFI system.
>> When the throttle plates are open you can see a lot of reverse-flow up
>> the stacks.
>> Surprised me - I thought that would only happen at lower revs.
>> dave
>>
>> -- 
>> Dave Londry
>> Embedded Spaces Inc. (ESI)
>> davel at emspace.com
>>
>> 604 589 9183 phone/fax
>> 604 721 2278 cell
>> Skype:embeddedspaces
>>
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