Dyno Day Quiz!!!!

[jdbubb at verizon.net (Dan Bubb)]

I don't remember where I read/heard it, but the ABA is supposed to flow better than the JH. 
Something like 140 CFM vs. ~120 CFM for a JH. A really good port job will net ~170 CFM for either head since valve size becomes the limitation. I'm sure of the ported number, sort of pulling the other ones out of my foggy memory. But that's the general area IIRC.
Plus despite the length of the ABA intake manifold it also should flow better than the JH manifold which really isn't all that good.

As far as AFR when it's pulled from the tailpipe, there is a fairly significant lag between the engine and the WB-O2.

So are you going to post a dyno plot???
I'm betting you're making your max HP at 5800-6000. But inquiring minds (or perhaps just busybodies) need to know!
Dan

From: "C Boyko" <roccit_53@xxxxxxxxxxxxxxxxxxxxxxx>
To: " Dan Bubb " <jdbubb@xxxxxxxxxxx>
Cc: <scirocco-l@xxxxxxxxxxxx>
Sent: Monday, October 15, 2007 5:55 PM
Subject: Re: Dyno Day Quiz!!!!


> On 8:18 am 10/15/07 "Dan Bubb" <jdbubb@xxxxxxxxxxx> wrote:
>> So,
>> Jason -10 for 217
>> Ben +44 for 218
> And, of course, I'm awfully
>> impressed that Cathy's getting 110 Hp out of a 1.8L 8V. Most of the
>> 2.0L 8V's that I'm aware of aren't getting more than 110 Hp unless they
>> have a professionally ported head and 272 cam or larger. So, I guess
>> that just goes to show that the stock ABA head/manifold outflows the JH
>> head/manifold and that removing the CIS intake restriction is a good
>> move for more HP. Course Timbo's recent 87 Hp out of a JH with dual
>> outlet manifold and MS also points out the advantage of removing the
>> CIS restriction. Dan
> 
> I was under the impression that the counterflow (ex JH) flows better than
> the crossflow (ABA). Mind you I do have that set of bigger AEG intake
> runners that bashes into the bracing on my hood! (And cooler intake air has
> to be a good thing, the counterflow arrangement has to heat it
> significantly).  And as for Ben's O2 readings, mine read between 12.5 and
> 13.5:1 on the datalogs, but more like 14:1 on the dyno plot, so at the
> tailpipe may actually read a bit leaner than if you check it higher up
> (which makes sense). So who knows what Ben's was really at if it topped out
> the reading at the tailpipe! It was a fun day for sure!
> Now what I'd REALLY like to know is whatr my fellow Canucks are putting
> down with the other Frankenbuilds!
> Cathy
> 
>