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> Dave Hunt's 2270 on SDS.. First pull on the dyno, Dave is back at Aircooled Heaven!
Jake Raby
post Jan 17 2008, 01:43 PM
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Dave has spent another week with us here at Aircooled Heaven.. The veterans of the board know Dave, know of his misfortune with his engine kit (several times) and know just how determined Charles and I were to get the issues figured out..


No need to revisit those (and for the sake of everyone) we won't be talking about what WAS the issue, because it has now been solved..

The point is Dave's engine made more power than any 2270 we had ever dynoed on pump gas and we have figured out why... More on that later.

I figured I'd post the numbers from today's very first pull.. This was done with SDS with DEFAULT fuel values, right out of the box!!

here is Dave's SDS/ Direct fire results from today.. This is running a ull cooling fan with no impellers removed, both tests we'll compare were exactly the same, we even kept the same advance curve as the Mallory that was on his engine during his last session and nothing else has been changed except carbs Vs EFI.

Note that this is one of the few times that we have had an EFI engine make more peak HP than a carbureted engine in back to back comparions. Typically the carbs kick the shit out of FI at peak power but the EFI kicks the shit out of carbs EVERYWHERE else, making a broader more usable power band with better average HP... This was an oddity that I attribute to the cam shaft design that I did for this engine- it is specifically made for EFI, but still does damn good with carbs..

With SDS
Attached Image

Same timing and set up with 45 Dells
Attached Image

Same Tangerine Evo exhaust was used for both tests, numbers are corrected for weather differences between Dave's last visit and today.

200HP with the stock fan is just a pull away... On pump gas and it doesn't need more than 6,000 RPM to do it.

I told you we'd whip this issue.

Like I said, this is right out of the box with our defauklt tuning.. Its not even close to optimized yet and was rich below 4500 RPM-

This post has been edited by Jake Raby: Jan 17 2008, 01:44 PM
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SirAndy
post Jan 17 2008, 01:48 PM
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damm, those are nice curves!
(IMG:style_emoticons/default/drooley.gif) Andy
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mudfoot76
post Jan 17 2008, 01:50 PM
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QUOTE(SirAndy @ Jan 17 2008, 02:48 PM) *

damm, those are nice curves!
(IMG:style_emoticons/default/drooley.gif) Andy

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And April still seems like such a long time away...
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messix
post Jan 17 2008, 01:52 PM
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this stuff makes me think that a six is not an option.

great power

simple install

no oil tank and lines

and lots more of that extra six expensive stuff

gee wiz!
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Jake Raby
post Jan 17 2008, 02:00 PM
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The first run with enrichment manipulation..

We are damn near finished with tuning.. Dave is making some timing changes as I type this..

Attached Image

Dave is watching everyt move I make and HE is tuning the tuning changes..

OK, now we tried some timing adjustments, almost ready to swap to the AX 12 blade fan and see what we get.. With carbs and that fan this same engine made 209 HP..
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Jake Raby
post Jan 17 2008, 02:11 PM
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Made a partial run with added timing, lost power and gained CHT.. Now we are going the other direction with a 2 degree timing reduction..

AFR- RPM fuel values are done :-)

After this verification pull it's time to play with variables like oil, fans and etc...
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904svo
post Jan 17 2008, 02:12 PM
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Dave must be one happy camper now!
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914Sixer
post Jan 17 2008, 02:31 PM
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Holy Shit Batman !!! Simply AMAZING !
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toon1
post Jan 17 2008, 02:33 PM
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QUOTE(Jake Raby @ Jan 17 2008, 12:11 PM) *

Made a partial run with added timing, lost power and gained CHT.. Now we are going the other direction with a 2 degree timing reduction..

AFR- RPM fuel values are done :-)

After this verification pull it's time to play with variables like oil, fans and etc...


What are the AFR's and timing curves
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Jake Raby
post Jan 17 2008, 02:39 PM
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Nope.. Not amazing, just fruits of our labor and development..

It is awesome though and even more cool that this is an engine that Dave built on a kit!

Here is the final dyno run with the stock fan, just as Dave will use it in the car..

Tuning is completed. We started at 1330 and were done in less than two hours. Dave will need to correct for some manifold pressure differences that we can't attain at my elevation when he gets it in the car..

Sometimes that 1HP is so hard to get...
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Jake Raby
post Jan 17 2008, 02:40 PM
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QUOTE(toon1 @ Jan 17 2008, 01:33 PM) *

QUOTE(Jake Raby @ Jan 17 2008, 12:11 PM) *

Made a partial run with added timing, lost power and gained CHT.. Now we are going the other direction with a 2 degree timing reduction..

AFR- RPM fuel values are done :-)

After this verification pull it's time to play with variables like oil, fans and etc...


What are the AFR's and timing curves



I ALWAYS target 13:1

If we post the timing curves someone else will try to use them and may harm their engine, without this cam, CR and set of heads these won't do anyone any good..
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Jake Raby
post Jan 17 2008, 02:52 PM
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OK, we swapped fans and did another comparison between carbs/ FI...

Here are the results.. Up first is todays SDS run with the modified fan.
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Jake Raby
post Jan 17 2008, 02:54 PM
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OK, we swapped fans and did another comparison between carbs/ FI...

Here are the results.. Up first is todays SDS run with the modified fan.
Attached Image

And here is the data from the last session with the exact same fan in place with carbs.
Attached Image

Everything matters!
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904svo
post Jan 17 2008, 03:12 PM
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Once again, Jake prove thats it's in the combo. Those graphs should made a
lot of people rethink about changing the engine when you can get a combo a
lot cheaper! An it fits with out modifications to the engine bay.

I think Dave will be busy when he gets home, with all those people pulling out their teeth.

Jake keep up the good work.
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Jake Raby
post Jan 17 2008, 03:15 PM
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Now I want to apply these changes to my 2316-210 current kit engine...

But it'll be 2010 before that happens.. Kits are locked in stone till then...

But I could always toss this cam in a typical 2270-175 for those who want the same engine :-)
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ConeDodger
post Jan 17 2008, 03:18 PM
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Oh my... Anyone interested in buying a just broken in 2270 so I can build another one????

Jake, how much do you think the Nickies are contributing? They are known for a bit of HP boost as well as some cooling advantage right?
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Jake Raby
post Jan 17 2008, 03:31 PM
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The Nickies are contributing greatly.. They allowed the CR for this engine to become so efficient.. The highest head temp we recorded was 335F during the entire session.. A BONE STOCK engine runs 15-20 degrees hotter than that..

Based on what I saw yesterday from a very, very similar combo running the same heads and cam they are making a 5% power addition..
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rhodyguy
post Jan 17 2008, 04:40 PM
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it's a stump puller at 6k. wow. notable changes in the temps with the ax fan? will the near sea level and humidity have a net + or - on the power? put the powerplant in the box and send dave home.

k
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toon1
post Jan 17 2008, 04:50 PM
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WOW!!! JUST FREAKIN WOW!!

212hp from a NA, type IV, that's awsome!
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Jake Raby
post Jan 17 2008, 04:58 PM
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The temp increase with the AX fan was 25-35 degrees over the stock fan, at higher RPM the mod fan cooled much better.

This engine has about 13-15 hours of run time on it and it runs better than it did when it first fired up!

I really think this one would live 90-100K if taken care of, even if beaten pretty hard. It's smooth as a cat's ass!
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