KFM 618 A Head - dyno update

So I got up this morning, made up a new top for the Trick Flow tunnel ram and installed a couple of shop Dominators. The Interceptor port is rather large, and i expected it to pull good up high.
This silly thing made almost 1208 at 7654 RPM and was still climbing.

[quote="Wheelie58"]So I got up this morning, made up a new top for the Trick Flow tunnel ram and installed a couple of shop Dominators. The Interceptor port is rather large, and i expected it to pull good up high.
This silly thing made almost 1208 at 7654 RPM and was still climbing. " Awesome" #s ,Congrats!!!

Nice numbers......

Gasoline FTW!

Good numbers Keith Proud of ya'

You can thank Uncle Charlie for helping Wilford design those W. W. Engineering shaft mounted rockers with the one piece intake stand. You can also thank TFS for sending Wilford one of those new style A-460 BBF 3X castings, to his shop for him to mock up on.

Be advised that if you are running more than 850 lbs. open valve spring pressure, there is a bolt upgrade for those H-K 5/16" shaft hold down bolts. They are kinda' pricy, but are ARP 2000 Series 5/16" bolts. Their shoulder may have to be turned down a little on the o.d. if you decide to use them.

Charlie Evans

Yeah Charlie....all of the pics and info that you posted about the one piece stand were great and prompted me to ask Wilfred to bring a set by the shop for a demo.
After trial fitting them, I just kept them.
Thanks for the tip on the stand bolts. I will check that out.
So far, after 4 pulls the lash is rock solid. Good parts are a pleasure to work with.
Thanks!
Keith

Keith be carefull.....gas and carbs are habit forming

Congrats.....

No worries Lem. Down here in the hills and hollers of Georgia, if we run out of methanol, there are other forms of alky that can be brewed up. We will save the gas for you city boys.
Thanks,
Keith

What were the final numbers from the single 4 barrel combination...?

GREAT with the dual 4's.

Randy
It was 1167 at 7400 and still climbing.
I only made 3 pulls on the single carb.
It was kinda fat, but since I did not own the carb, I did not mess with it.
Since I will not typically run the engine that high, I chose not to buzz it up to find peak HP.
Chicken?? Sure !
I think it will pull way past 8000...
With more tuning and bigger nads, 1200 on a single is very possible.
A bigger cam would also help. I kept it conservative to help spring life.
This is my Super class/ Index and C/Gas engine and it has to be durable.
Thanks
Keith

Very nice.

Good job Keith !!

nice!

Sweeeeeeetttttt

Wow... Just .... WOW !! Earlier today, we were bench racing, talking about 1200 horsepower turbo motors.......

Very well done Keith.Congrats

Be interested to see the methanol # 's and crank case vac as everybody up here with moved back to carbs and gas on bores 4.550" and bigger as the usual for alcohol is to be down 50 -70 hp on a 15-1 600inch motor and be down 10 inches on crankcase vac
Frank

Watched a 706 all aluminum BBC make 1450 hp with my domi's this spring and when they witched to toilets it was down to the best of 1190hp with 3psi crank pressure , a re ring and 3 weeks alter with a FAST system on gas it was 1490hp
Frank

Cangrats looking farward to seeing old red make a few passes down at Sgmp when you back down this way

The beauty of alcohol, is the lack of variance with the change of temp and atmosphere, it works good dead fat to piston burning lean, with very little variation.

The bummer... is compared to a gasoline tune you need to chase around.. your leaving BTU and HP out of the combination.

If your thing is bracket racing........ run the same every pass... alcohol.

If your thing is top 16 or all out competition, gas. Or there is always nitromethane

A little update...
Stuck my twin 4" flying toilet setup on the 618 tonight with alky.
Did not get my fuel picked up in time, so I only had enough for a warm up and quick pull.
It fired right up and sounded real clean. The vacuum was off by about 2 inches and it made 1150 HP.
Keep in mind... this was a swag tune up. I picked a #90 main jet, because the pill holder box had that one exposed and ready to pick.
I will get to flog it more when I get some fuel....
sounds so good that I am real tempted to just stick it in the car and go racing.
Keith

PS...this was not intended to wake up the gas vs alky deal. I just thought some results may help someone.

Wheelie58 wrote:Randy
It was 1167 at 7400 and still climbing.
I only made 3 pulls on the single carb.
It was kinda fat, but since I did not own the carb, I did not mess with it.
Since I will not typically run the engine that high, I chose not to buzz it up to find peak HP.
Chicken?? Sure !
I think it will pull way past 8000...
With more tuning and bigger nads, 1200 on a single is very possible.
A bigger cam would also help. I kept it conservative to help spring life.
This is my Super class/ Index and C/Gas engine and it has to be durable.
Thanks
Keith

That is a nice piece Keith and you did all the work yourself. That has to be real rewarding. Ted and Wilfred are real good people too. Been using Wilfred's rockers since the 90's. Ted's been at it building BB Ford's for a long time way back when nobody would even try. Looking forward to hearing how it runs.

Thanks for all of the nice comments.
Made a few pulls today with the toilets and alky.
Spent a lot of time trimming the high speed pressure and flow, since I was never real happy with my old calibration.
No doubt that the methanol has an effect on the ring seal. My vacuum was down 5-7 inches on some pulls compared to the gas carb. I experimented with a real light .043/.043/3mm ring combination for this setup.
The best pull was within 30 HP of the best gas twin carb pull and was equal to the single Braswell gas carb.
There is still more to get. My 4 vane Moroso vacuum pump started to make a noise...so I pulled the plug on the days test. The shaft needed replaced but I didn't have time to get one when I maintenanced it.
I am pretty happy with the results considering that the carbs that I used for testing were very "high end".
The big plus on the test is the fact...that my port will be good for many future applications. I don't think we ever buzzed it over 7650 or 7700, and it was still climbing.
Might be good for a big bore high RPM mud race or truck pull deal. More time will tell.
These tests were all performed with the same intake manifold, just swapping tops.
Another strange detail...the gas carbs made best power at 34 degrees of timing. The alky liked 30 degrees...just like my old 605. This 618 has rather small 69cc chamber...
Pondering the idea of putting a gas carb back on for a few more "learning" pulls before sticking the engine on the car.
Thanks
Keith

Nice job Keith. ~34* is typical with that kind of a deal on gas.

I just dropped the timing (alky) to 27 and picked 10 HP!
Took it down to 25 and it fell off above 7000 2 or 3 HP
It looks like 27 or 28 for me.

Wheelie58 wrote:I just dropped the timing (alky) to 27 and picked 10 HP!
Took it down to 25 and it fell off above 7000 2 or 3 HP
It looks like 27 or 28 for me.

I hate to over use "typical" but, when one gets 'at' the sweet spot for ign. timing a 1*-2* move usually just trades tq. for hp or hp for tq.