Big Bore Boss build

[stkjock]

You two are evil.

 

[s8v4o]

Any guesses on what it will run?

Based on his power and assuming around 3750lbs

11.30 seconds and MPH of 118.52 MPH.

Nice Bruce! Looks like it turned out well for you.

 

[BruceH]

Based on his power and assuming around 3750lbs

11.30 seconds and MPH of 118.52 MPH.

Nice Bruce! Looks like it turned out well for you.

The last time I weighed the car it had a Whipple and full tank of gas. I was in the car too. It weighed 3950 on a certified cat scale. I have a good 50 lbs of dynamat installed and carry about 30 lbs of tools and parts just because.

I'd imaging the iron block makes up for the loss of the Whipple weight wise.

If I was able to get anywhere near 11.5 I'd be very happy. Anywhere in the high 11's would be acceptable to me.

Thanks for the compliment.

 

[01yellerCobra]

It would feel stronger with a Paxton/Vortech force feeding it!

Have to agree with stkjock. A BB set up is perfect for a centri. The extra displacement gives torque down low and the blower keeps things moving on top.

Just sayin.

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[BruceH]

Have to agree with stkjock. A BB set up is perfect for a centri. The extra displacement gives torque down low and the blower keeps things moving on top.

Just sayin.

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It's plenty strong as is and there is nothing hanging off the motor. It really feels just like the stock motor did with a whipple and 3.625" pulley with the frpp tune. Makes the same hp too. Well, 1 more actually, lol. It feels strong all the time. It's a fun power level for me.

This weekend I'll go to 92 pump gas and see how much power it loses. I'm hoping to stay at or above 400rwhp. It will stay on gas until the track opens back up in April. There will be one more dyno coming up to verify the gas tune. My road pulls are in 2nd gear and they work pretty well for tuning but I really like to verify on the dyno in 4th gear.

 

[stkjock]

Add some giggle juice.

 

[01yellerCobra]

It's plenty strong as is and there is nothing hanging off the motor. It really feels just like the stock motor did with a whipple and 3.625" pulley with the frpp tune. Makes the same hp too. Well, 1 more actually, lol. It feels strong all the time. It's a fun power level for me.

This weekend I'll go to 92 pump gas and see how much power it loses. I'm hoping to stay at or above 400rwhp. It will stay on gas until the track opens back up in April. There will be one more dyno coming up to verify the gas tune. My road pulls are in 2nd gear and they work pretty well for tuning but I really like to verify on the dyno in 4th gear.

I just wanted to join in on the ribbing. I have a BB stroker set up in my car. And I really like it. When I was N/A it put down 326/329. And I don't have the compression you have. I think you made a good choice.

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[BruceH]

I just wanted to join in on the ribbing. I have a BB stroker set up in my car. And I really like it. When I was N/A it put down 326/329. And I don't have the compression you have. I think you made a good choice.

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I understand, lol. You are practicing for evil status.

The car was switched over to 92 pump gas today. Runs great and still runs strong but not as strong as with e85. I have spark limited to 28 degrees of advance at wot, that's 6 degrees difference than with e85. I'd imagine that's part of the power loss.

If I was guessing I'd guess it's right around 400-410rwhp right now. I'll get back on the dyno sometime in the future and verify that everything is good while getting some gasoline hp numbers.

The gas tune is running under 5% variation in fuel trims. To me that means the maf xfer, fuel, and injector data is spot on. We will see how it looks at wot when I get the chance for datalogs.

 

[rojizostang]

what did your final compression ratio turn out to be? was it 12 to 1?

 

[BruceH]

what did your final compression ratio turn out to be? was it 12 to 1?

Yes. It could be a little different one way or another depending on what calculator is used. I used the one on Wallace Racing calculators webpage.

http://www.wallaceracing.com/cr_test2.php

 

[rojizostang]

it's awesome that you can run that much compression on pump gas.

 

[BruceH]

it's awesome that you can run that much compression on pump gas.

Car technology just keeps getting better and imo Ford is leading the way. The ecu allows for adjusting spark advance in cells that are controlled by rpm, load, iat, ect, and a few things I'm forgetting right now. I also think that e10 helps to cool the combustion chambers enough to matter, and enough that we can get away with higher compression on 92 pump gas.

FWIW I have a 2012 Focus that runs 12:1 on 87! I think that direct injection and twin variable cams help it to do that. 160hp with 2 liters of displacement and it gets great mileage. There was a time when a 350 Chevy didn't make that much hp. IIRC my 71 Chevelle was factory rated at 140hp or some ridiculous number like that.

 

[lethe]

FWIW I have a 2012 Focus .

I think we found a donor vehicle for your spare motor..

 

[daveyboy]

I think we found a donor vehicle for your spare motor..

This!!!

 

[saleen07gt]

Impressive results ! Glad to hear the drivability is good, this inspires me to build a similar combo. All motor cars rule !

 

[AnotherS197GT]

Bruce, this is an awesome build! I call dibs on the long block when you decide its time for something else!

 

[BruceH]

Impressive results ! Glad to hear the drivability is good, this inspires me to build a similar combo. All motor cars rule !

I'm very happy with the outcome. The power is noticeable. You would not be disappointed.

Bruce, this is an awesome build! I call dibs on the long block when you decide its time for something else!

Here's the total breakdown on costs for anyone else who is interested.

Block $1210
Pistons $900
Rings $100
Rods $125
Crank $400
Bearings $150
Machine Work $1000

Total for 322 cubic inch modular shortblock was $3885. Once all the other parts are figured in the total cost is around $8000 which seems high at first glance but in reality it's less than a supercharger and forged motor for a motor that makes similar numbers to low boost setups. It could still be safely supercharged.

I found a hell of a deal on the crank and rods. Manley rods with arp2000 bolts and a 3.75" stroke Kellogg crank for $525 shipped.

I came close to doing the build with a stock crank and Boss rods. Boss rods with new rod bolts are less than $200 brand new. Piston cost would of went down to $600 with a stock stroke compression height.

That would of resulted in a 304 cubic inch block for around $3200. If I hadn't come across the crank and rods deal I would of went with the 304 build.

Anyone could do the 304 inch build and have an oversquare 5 liter motor that would be strong enough for forced induction. I'm really surprised it's not a popular build for those who want a forged motor. They would still have a stock block left over to put on the engine stand.

 

[01yellerCobra]

I think the cost of the new block turns people away from the big bore set ups. That and going to an iron block. At first I tried to talk the wife into letting me swap in a BB stroker. The vert could definitely use the torque. But then she agreed to a GT500 swap down the road.

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[BruceH]

I think the cost of the new block turns people away from the big bore set ups. That and going to an iron block. At first I tried to talk the wife into letting me swap in a BB stroker. The vert could definitely use the torque. But then she agreed to a GT500 swap down the road.

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It's easier to ask for forgiveness than permission, lol. I learned that when I was collecting guns.

 

[01yellerCobra]

It's easier to ask for forgiveness than permission, lol. I learned that when I was collecting guns.

Lol. I've learned to pick and choose over the years. Or just budget in something for the house.

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