350hp All Motor Build for the Average Joe
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Honda-Tech Member
Joined: Oct 2001
Posts: 4,560
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From: Indianapolis, USA
350hp All Motor Build for the Average Joe
We haven’t been able to do as much racing this year as we had anticipated due to some family changes of my own….mainly a 6lb 14oz little girl named Sophia who was born a few days ago 
and today we saw $5.25 a gallon for diesel in our town 
amongst other things. So instead of sitting around being bored, we have been tinkering around in the shop getting some motors setup that could be considered “budget” forms of what we run in our race car….something that anyone could get their hands on easily and something that would be considered reliable for a motor of this nature.
What is my definition of “budget”? Anyone who has put a sincere effort into truly achieving 350 NA DynoJet horsepower on a 4 cylinder either found themselves coming up short, or they invested the time and big bucks into making it happen. I think everyone would be surprised how few 350hp motors are out there. When I say budget, I don’t mean cheap parts. I don’t believe in using half-*** parts. I mean something that you don’t have to spend 150 hours on a flow bench or test 10 sets of cams and 5 sets of valve springs to achieve your number. We did all that for you
For this motor we will be using a stock stroke…actually a 100% stock K24 crank, off the shelf rods, shelf pistons, readily available camshaft, and our K-series cylinder head. These are all things that anyone can get their hands on in a timely manner.
Block:
• CRV K24A1
• Stock 99mm crankshaft – stock bearing size
• BluePrint Mfg M-1 Abrams sleeves (www.blueprintracing.com)
• Carrillo shelf connecting rods
• 4 Piston Racing Spec 89.5mm Wiseco piston (www.team4piston.com)
Cylinder Head:
• CRV K24A1 head
• 4 Piston Racing head porting by Josh Klein (347cfm @ 28” on our SF1020 and around 360 on every SF600 we have tested on). The head is something we have been working on for 3 years. We have hundreds of hours and more than a few heads tossed into the scrap pile to get to where we are with our race head. This particular one is designed to work with gas and a smaller cam. We purchased heads from every major Honda head porter in the country over the past 3 years and we think we have something that no one is giving to their customers. Can others get their stuff to flow like that? Probably…this isn’t rocket science and there are a lot of smart guys out there, but the heads that actually get shipped to customers won’t touch it. We have had guys send us $3000 heads and they tell us they will flow 360 all day @ 28….then they flow 320 or 330. Of course it is “our bench” that is messed up
• 4 Piston Racing Single Roller camshafts
• 4 Piston Racing Valve Springs
• 4 Piston Racing Stainless valves
• Kinsler Individual Throttle Bodies (www.kinsler.com)
Here is a flow chart from our SF1020 Pro Bench of this head with 1mm os intake valve vs. the stock head. We see guys posting up charts with the stock K heads flowing 290-295....they flow 278-283 on ours depending on the casting.
I also forgot to mention that we flow at 50" then convert back to 28". I have had someone call us some dumb names for doing that, but that is how we were taught to use the bench. If you guys want straight up 28" numbers I can do that too, but it just adds about 10cfm to everything I have here.
Q: What is the difference between this motor and the motor in our race car?
A: About 30hp is a guess…we don’t know what this one will make yet. This motor has a smaller stroke, smaller camshaft, smaller intake valve (head flows about 18cfm less), steel rods, and the piston is a heavier design built for a longer lasting motor with less ring maintenance.
The Goal:
350hp on a basic stock stroke motor
The Dyno:
We know how people like to post dyno charts and how highly criticized they are, so we will be running the car on a 3rd party Mustang Dyno then we will load the car and take it straight to a DynoJet. I would toss it on a DynaPack as well (my personal favorite dyno) but the closest one to us is 4 hours away. If someone wants to see some glory numbers feel free to send me a check for diesel and I would be thrilled to have the car on a DynaPack for the chance to use it
Fuel:
We run alcohol, the car is set up for alcohol, but we know some people will claim that it automatically makes ridiculous power over good gasoline. To put that criticism to rest, we will dyno the car on alcohol AND on gasoline. We already know we can make close to the same power on gas, it just isn’t as forgiving to my happy little tuning fingers and will take a little extra effort to get there
Time Table:
I hate when people post builds on here and then you wait 9 months to see it come up short! The motor will be together at the end of next week and we will be on the dyno within 2 weeks. I will update this as I can.
Will we reach the 350hp goal? I'm not sure yet, but just for reference here is the last 99 stroke motor we had on the dyno. Pretty similar to this one, but we have made some changes to the ports and valvetrain setup. Don't laugh at the dip...that is my twitchy right foot bouncing on the pedal after the car bounces from that silly Tilton clutch Did I mention I wish we had a Dynapack close by?
If you have any questions about the motor or want to know how you can have one under your hood, email me at info@team4piston.com or call Josh in the shop at 317-966-1094.
Modified by 4piston at 1:02 PM 5/29/2008
and today we saw $5.25 a gallon for diesel in our town amongst other things. So instead of sitting around being bored, we have been tinkering around in the shop getting some motors setup that could be considered “budget” forms of what we run in our race car….something that anyone could get their hands on easily and something that would be considered reliable for a motor of this nature.What is my definition of “budget”? Anyone who has put a sincere effort into truly achieving 350 NA DynoJet horsepower on a 4 cylinder either found themselves coming up short, or they invested the time and big bucks into making it happen. I think everyone would be surprised how few 350hp motors are out there. When I say budget, I don’t mean cheap parts. I don’t believe in using half-*** parts. I mean something that you don’t have to spend 150 hours on a flow bench or test 10 sets of cams and 5 sets of valve springs to achieve your number. We did all that for you
For this motor we will be using a stock stroke…actually a 100% stock K24 crank, off the shelf rods, shelf pistons, readily available camshaft, and our K-series cylinder head. These are all things that anyone can get their hands on in a timely manner.
Block:
• CRV K24A1
• Stock 99mm crankshaft – stock bearing size
• BluePrint Mfg M-1 Abrams sleeves (www.blueprintracing.com)
• Carrillo shelf connecting rods
• 4 Piston Racing Spec 89.5mm Wiseco piston (www.team4piston.com)
Cylinder Head:
• CRV K24A1 head
• 4 Piston Racing head porting by Josh Klein (347cfm @ 28” on our SF1020 and around 360 on every SF600 we have tested on). The head is something we have been working on for 3 years. We have hundreds of hours and more than a few heads tossed into the scrap pile to get to where we are with our race head. This particular one is designed to work with gas and a smaller cam. We purchased heads from every major Honda head porter in the country over the past 3 years and we think we have something that no one is giving to their customers. Can others get their stuff to flow like that? Probably…this isn’t rocket science and there are a lot of smart guys out there, but the heads that actually get shipped to customers won’t touch it. We have had guys send us $3000 heads and they tell us they will flow 360 all day @ 28….then they flow 320 or 330. Of course it is “our bench” that is messed up
• 4 Piston Racing Single Roller camshafts
• 4 Piston Racing Valve Springs
• 4 Piston Racing Stainless valves
• Kinsler Individual Throttle Bodies (www.kinsler.com)
Here is a flow chart from our SF1020 Pro Bench of this head with 1mm os intake valve vs. the stock head. We see guys posting up charts with the stock K heads flowing 290-295....they flow 278-283 on ours depending on the casting.
I also forgot to mention that we flow at 50" then convert back to 28". I have had someone call us some dumb names for doing that, but that is how we were taught to use the bench. If you guys want straight up 28" numbers I can do that too, but it just adds about 10cfm to everything I have here.
Q: What is the difference between this motor and the motor in our race car?
A: About 30hp is a guess…we don’t know what this one will make yet. This motor has a smaller stroke, smaller camshaft, smaller intake valve (head flows about 18cfm less), steel rods, and the piston is a heavier design built for a longer lasting motor with less ring maintenance.
The Goal:
350hp on a basic stock stroke motor
The Dyno:
We know how people like to post dyno charts and how highly criticized they are, so we will be running the car on a 3rd party Mustang Dyno then we will load the car and take it straight to a DynoJet. I would toss it on a DynaPack as well (my personal favorite dyno) but the closest one to us is 4 hours away. If someone wants to see some glory numbers feel free to send me a check for diesel and I would be thrilled to have the car on a DynaPack for the chance to use it
Fuel:
We run alcohol, the car is set up for alcohol, but we know some people will claim that it automatically makes ridiculous power over good gasoline. To put that criticism to rest, we will dyno the car on alcohol AND on gasoline. We already know we can make close to the same power on gas, it just isn’t as forgiving to my happy little tuning fingers and will take a little extra effort to get there
Time Table:
I hate when people post builds on here and then you wait 9 months to see it come up short! The motor will be together at the end of next week and we will be on the dyno within 2 weeks. I will update this as I can.
Will we reach the 350hp goal? I'm not sure yet, but just for reference here is the last 99 stroke motor we had on the dyno. Pretty similar to this one, but we have made some changes to the ports and valvetrain setup. Don't laugh at the dip...that is my twitchy right foot bouncing on the pedal after the car bounces from that silly Tilton clutch
Did I mention I wish we had a Dynapack close by? If you have any questions about the motor or want to know how you can have one under your hood, email me at info@team4piston.com or call Josh in the shop at 317-966-1094.
Modified by 4piston at 1:02 PM 5/29/2008
King of the One Liners
Joined: Apr 2001
Posts: 6,485
Likes: 2
From: Jersey, USA
Re: 350hp All Motor Build for the Average Joe (4piston)
A lot of power can be made on a stock k24 crank. . .
You are exactly right though, that is directly relative to the headwork when dealing with a build where hp goals are that high.
Looking good man, cant wait for some updates and I just got done reading it !
BTW: Congrats on the little one !
Honda-Tech Member
Joined: Mar 2002
Posts: 9,854
Likes: 4
From: Southern California, U.S.A.
Re: 350hp All Motor Build for the Average Joe (4piston)
K-series FTMFW! Nice flow numbers. It seems like it is getting too easy with the K-us B-series guys don't stand a chance 
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King of the One Liners
Joined: Apr 2001
Posts: 6,485
Likes: 2
From: Jersey, USA
Re: 350hp All Motor Build for the Average Joe (vivid 02)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vivid 02 »</TD></TR><TR><TD CLASS="quote">I should start saving my penny's up to go K next year
Is anyone here a stock broker to help me out </TD></TR></TABLE>
Just sell drugs, its much faster . . .
Is anyone here a stock broker to help me out
</TD></TR></TABLE>Just sell drugs, its much faster . . .
Honda-Tech Member
Joined: Feb 2004
Posts: 1,036
Likes: 0
From: T Dot
Re: 350hp All Motor Build for the Average Joe (2fastGSR)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2fastGSR »</TD></TR><TR><TD CLASS="quote">
Just sell drugs, its much faster . . . </TD></TR></TABLE>
lol
Just sell drugs, its much faster . . .
</TD></TR></TABLE>lol
Honda-Tech Member
Joined: Mar 2006
Posts: 385
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From: Home of the fastest Hondas in the 417 area since, 1997, usa
Re: (rebo0t)
we are making 319hp with a stock 99mm crank, ported RBC with a 70mm Bseris TB, and running on E85 so this should be more than abtanable for you guys with the plan you have laid out. Good luck 
K FTW
K FTW
Thread Starter
Honda-Tech Member
Joined: Oct 2001
Posts: 4,560
Likes: 2
From: Indianapolis, USA
Re: 350hp All Motor Build for the Average Joe (blinx9900)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blinx9900 »</TD></TR><TR><TD CLASS="quote">when you say you will run the egnine on gas, what octane will you be using?</TD></TR></TABLE>
Race gas for sure, probably C16. A few people have PM'd me saying 350 should be capable on pump gas. I appreciate everyone's opinions, and best of luck trying that out. With 350 you can do 140mph in a Pro chassis.
Short block is together. Josh is starting on the head tomorrow. I'll get some pics up when I get home from my business trip. Thanks for the comments guys.
Race gas for sure, probably C16. A few people have PM'd me saying 350 should be capable on pump gas. I appreciate everyone's opinions, and best of luck trying that out. With 350 you can do 140mph in a Pro chassis.
Short block is together. Josh is starting on the head tomorrow. I'll get some pics up when I get home from my business trip. Thanks for the comments guys.
* B A N N E D *
Joined: Feb 2008
Posts: 319
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From: lol, lol
Re: 350hp All Motor Build for the Average Joe (29psiHybrid)
hahahaha.
i had no [freak]ing idea the crv head could be cut to flow so high. fuuuckkking insane.
no one in this world can say they have a midsize suv 4 cylinder motor making 350hp. naturally aspirated.
i had no [freak]ing idea the crv head could be cut to flow so high. fuuuckkking insane.
no one in this world can say they have a midsize suv 4 cylinder motor making 350hp. naturally aspirated.