2017 engine build

[Cobra #3170]

Picture shows new small journal rod for 9000 rpm FE engine. Sonny Briant
Timkin steel, center counter crank is not here yet, will post pictures when it comes in.

[patrickt]

Originally Posted by Cobra #3170

Picture shows new small journal rod for 9000 rpm FE engine. Sonny Briant
Timkin steel, center counter crank is not here yet, will post pictures when it comes in.

Well that will sound spectacular. 6500 sounds super, 9000 will be out of this world. What about the other parts? Valve train, etc.

[Cobra #3170]

Originally Posted by patrickt

Well that will sound spectacular. 6500 sounds super, 9000 will be out of this world. What about the other parts? Valve train, etc.

Patrick
Yes using small stem titanium intake and exhaust valves to keep the weight down and a new cam with more exhaust duration and lift, intake lobe will be similar to today's 281@ .050 and 297 @ .050 exhaust both right around .800 lift
a little more aggressive ramp in the middle. Using the very best NASCAR springs this time. The old engine pressures were still at installed levels but thought I should upgrade because of rpm. They are supposed to be better material. Individual roller rockers and .125 wall 3/8" trend push rods. !5 to 1 compression ratio with smaller chamber and a slight pop up on piston. Trying Line to Line coating process on pistons too. The crank should be a work of art according to Kinetics. Head flow is around 380 cfm so that is the limiting factor although we will do some manifold work too. Installing a modern EFI this time with traction control because it is legal now in Goodguys.

[Morris]

Bruce

I'm really glad to see you doing the changes to the FE....I look forward to your success with the motor......is Kinetics doing the motor....?? I ran out of money ....but I wanted to try some of the Ideas you are doing.....I believe it could become a very reliable and strong motor....keep us abreast of the progress.....

[Cobra #3170]

Originally Posted by Morris

Bruce

I'm really glad to see you doing the changes to the FE....I look forward to your success with the motor......is Kinetics doing the motor....?? I ran out of money ....but I wanted to try some of the Ideas you are doing.....I believe it could become a very reliable and strong motor....keep us abreast of the progress.....

Hi Morris,
Yes Kinetics is doing the new one too, I have had so much good luck with them for over 23 years on 5 different engines I would not go anywhere else.
It will be interesting to see how well it works, was turning the old one 8200 on a regular basis and it looked like new inside other than some valve guide wear.

[Morris]

Originally Posted by Cobra #3170

Hi Morris,
Yes Kinetics is doing the new one too, I have had so much good luck with them for over 23 years on 5 different engines I would not go anywhere else.
It will be interesting to see how well it works, was turning the old one 8200 on a regular basis and it looked like new inside other than some valve guide wear.

Bruce

That's great to hear... as you may or may not know Kinetic's built our motor and our motors used a lot of the same componets ..... I remember seeing your block when it was in pieces and they welded it back together and rebuilt the whole engine ....

I've been very happy with my motor ... I believe the only difference was the Fuel injection you were using and ours used a Holley 4500 Carb.... we were shooting for Road America where we could open it up down the 3 big straight away's and it worked great.....we were only running 7500 rpm's....

But I always wanted to make some changes for some of the shorter tracks... but never got there....

I'm excited for you and will be watching all of the development you come up with .... I'm just a FE Fan and once we got the breathing issue worked out... it to me.....was a motor to be dealt with

Keep us abreast of your progress. and get Chris to take lot's of photo's...

Morris

[fordracing65]

Traction control should be a game changer for you. I can't wait to see the dyno sheet.

[Cobra #3170]

Originally Posted by fordracing65

Traction control should be a game changer for you. I can't wait to see the dyno sheet.

So many people were cheating last year that they just gave up and made it legal for Goodguys. My understanding is that ABS and electronic shocks will also be legal in 2017. Looking at computer data we were below 1900 rpm in 3 corners so the main emphasis is getting minimum RPM higher and then being able to run 9000 rpm reliably. I have a 4.88 rear gear ready to go in so we should be better getting off tight corners. Engine acceleration should be much better too but I suspect we will lose horsepower.
Torque will likely be in the mid 500's now but we had too much anyway.
It is a real gamble because the 498 engine was really strong everywhere just hope I made the right move. The cars handling and brakes are close to optimum now so this was the only place we could potentially pick up time over last year.
All our competitors are going nuts with either mods such as $10,000 Bosch racing ABS units and GM electronic shocks or even all new cars. We probably showed them too much speed in November but I like to go for it as does Scott. Robby Unser chastised us for showing our entire hand but I liked seeing their reaction to the cars speed. Good old shock and awe, of course that just spurred them on so maybe Robbie was right.

[Cobra #3170]

Here is a photo of the new Sonny Bryant short stroke small bearing crank. Note center throw counter weight. 9300 rpm can't be far away!

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[1795]

Pretty impressive! Looks nice.

[Dwight]

very interesting

Tell us more


Dwight

[Cobra #3170]

Originally Posted by Dwight

very interesting

Tell us more


Dwight

They have not finished the heads yet so no flow numbers but I think it will be down on HP vs last year probably around 800 or a little less. We are about 4 weeks from dyno runs. Changing to FAST XFI injection and a different data acquisition system with predictive lap timing so that he will know where he is as he runs vs a target lap. RED Yellow Green lights on cowl. Scott is good enough to read stuff like that and push harder if needed.

[Blue66]

Wow !! It's great your working the FE. I am still stuck in 1970

[olddog]

Originally Posted by Cobra #3170

Here is a photo of the new Sonny Bryant short stroke small bearing crank. Note center throw counter weight. 9300 rpm can't be far away!

[/url]

Out of curiosity, what was the bore and stroke in the old engine and what will the new engine be?

[Cobra #3170]

Originally Posted by olddog

Out of curiosity, what was the bore and stroke in the old engine and what will the new engine be?

Old engine bore = 4.32 stroke = 4.25

New engine bore = 4.32 stroke = 3.75

[olddog]

By my old rule of thumb you are likely giving up 75 ft-lb of torque, but if you spin it to 9300 you should make the same Hp as the bigger motor made at 8200. Since you changed the ramps on the cam, you should pick up a bit more power.

I'm not sure that you are going to gain anything in the usable power range, in terms of MPH of the car, assuming that the gear ratio change has you running the same speed at maximum rpm of both engines. At least in theory you would need ~13% more rpm to put the same Hp to the wheels at the lower torque output. Wherever the torque dropped off (on the low rpm side of the torque curve) happen on the long stroke, it should happen on the short stroke at 13% higher rpm. So the usable torque range of both engines should give the same speed range, even though the rpm range of the short stroke is a bit longer.

That said, theorys don't always hold water. Since you said you already had too much torque to start with, I would bet this is going to help you out a bit. You may have to play with the rear end ratio a bit. I'm thinking you do not want to drop the ratio as much as the stroke ratio was changed. Maybe half way.

Keep us informed, I find this quite interesting.

[1795]

I think what 3170 is trying to gain with the higher rpm range is the ability to shift at a later point, or not shift at all in certain situations, on the courses that he will be racing on. The lower torque will not bother him that much, and even if there was a cost to the lower torus it would be more than offset by the ability to avoid several shifts during the course. Upshifting, and especially downshifting adds to the total time on a race course. Whether it be in a solo event or on a road course.