1.5 Turbo Motor Build

PRL Motorsports

Premium Performance Products
Elite Sponsor
Joined
Jan 26, 2017
Messages
1,310
Reaction score
3,530
Location
Export, PA
Website
prlmotorsports.com
Car(s)
2017 Civic Si, 2016 Civic EX-T, 2018 Type R
Country flag
We figured that it's only a matter of time before somebody pushes the 1.5T platform to the max and know that we will eventually need an engine with forged internals. We decided to follow suit with the rest of the platforms we're involved in and develop a motor program for the 1.5 Turbo.

We will be using brand new OEM Honda Si cylinder blocks, crankshafts oil jets/squirters, gaskets and hardware.

DSCN0715_zpssav33bgv.jpg

2017+ Civic Si block

DSCN0743_zpseepnmtym.jpg

Notice the coolant passages at the tops of where the sleeves intersect. Also notice the aluminum cast around the top layer of the iron sleeve.

DSCN0718_zpsbzsvenpg.jpg

Main caps; no main girdle here. Honda's past K-Series motors featured a factory girdle system.

DSCN0725_zpskdpiyacj.jpg

Awe look how cute! 73mm Si 10.3:1 compression piston.

DSCN0727_zps6vebslfz.jpg

The factory piston features a narrow piston skirt with a unique "spotted" friction coating.

DSCN0729_zpsgatqgw9w.jpg

These pistons also have quite a bit of material between the rings; A rather beafy design.

DSCN0732_zpskcoh3zbv.jpg

Such a cute little factory connecting rod!

DSCN0740_zpsqoeaddkk.jpg

M6 rod bolts :(

DSCN0733_zps6x21dh9t.jpg

The rotating assembly can ALMOST fit an a USPS Large Flat Rate Box! :lol:

DSCN0734_zpsswmszkn3.jpg

The left side is a 2.0L Type-R connecting rod, right is a 1.5T Si connecting rod.

DSCN0735_zpscseiymtc.jpg

DSCN0736_zps8b9alts0.jpg

The left side is a 2.0L Type-R piston, right is a 1.5T Si piston.

Our goal is to offer a short block capable of holding ~500 whp. The build will most-likely consist of forged H-beam rods and forged pistons. We will be working to develop a drop-in piston set designed to mimic Honda's factory piston design. This will be extremely important for fuel atomization and combustion with the direct injection system. A ~10.3:1 compression ratio is a rather comfortable number for us as well, as it's high enough to keep turbo spool and response there, but not high enough that we are worried about detonation/knock issues.

We are also sourcing/developing a proper head stud and other components to be able to hold the power as well. Please stay tuned! :thumbsup:



Advertisement


 
Last edited:

omigulay

Senior Member
Joined
Oct 17, 2016
Messages
228
Reaction score
117
Location
Vancouver, Canada
Car(s)
2017 Civic Sport hatchback
I just saw it on your instagram account. Very exciting news!

Is the block different between the SI and regular 1.5T?
 

05NBPDC5

Senior Member
First Name
Jacob
Joined
Jun 21, 2017
Messages
59
Reaction score
60
Location
Alpharetta, GA
Car(s)
05 RSX SC, 2011 RDX, 92 Civic hatch
Country flag
Also, I believe the left and right are reversed from your description.
 

cmwalton16

Senior Member
Joined
Feb 12, 2017
Messages
703
Reaction score
714
Location
Tennessee
Car(s)
2017 Civic Si Coupe ABM, 2016 Civic Touring CBP
We figured that it's only a matter of time before somebody pushes the 1.5T platform to the max and know that we will eventually need an engine with forged internals. We decided to follow suit with the rest of the platforms we're involved in and develop a motor program for the 1.5 Turbo.

We will be using brand new OEM Honda Si cylinder blocks, crankshafts oil jets/squirters, gaskets and hardware.

DSCN0715_zpssav33bgv.jpg

2017+ Civic Si block

DSCN0743_zpseepnmtym.jpg

Notice the coolant passages at the tops of where the sleeves intersect. Also notice the aluminum cast around the top layer of the iron sleeve.

DSCN0718_zpsbzsvenpg.jpg

Main caps; no main girdle here. Honda's past K-Series motors featured a factory girdle system.

DSCN0725_zpskdpiyacj.jpg

Awe look how cute! 73mm Si 10.3:1 compression piston.

DSCN0727_zps6vebslfz.jpg

The factory piston features a narrow piston skirt with a unique "spotted" friction coating.

DSCN0729_zpsgatqgw9w.jpg

These pistons also have quite a bit of material between the rings; A rather beafy design.

DSCN0732_zpskcoh3zbv.jpg

Such a cute little factory connecting rod!

DSCN0740_zpsqoeaddkk.jpg

M6 rod bolts :(

DSCN0733_zps6x21dh9t.jpg

The rotating assembly can ALMOST fit an a USPS Large Flat Rate Box! :lol:

DSCN0734_zpsswmszkn3.jpg

The right side is a 2.0L Type-R connecting rod, left is a 1.5T Si connecting rod.

DSCN0735_zpscseiymtc.jpg

DSCN0736_zps8b9alts0.jpg

The right side is a 2.0L Type-R piston, left is a 1.5T Si piston.

Our goal is to offer a short block capable of holding ~500 whp. The build will most-likely consist of forged H-beam rods and forged pistons. We will be working to develop a drop-in piston set designed to mimic Honda's factory piston design. This will be extremely important for fuel atomization and combustion with the direct injection system. A ~10.3:1 compression ratio is a rather comfortable number for us as well, as it's high enough to keep turbo spool and response there, but not high enough that we are worried about detonation/knock issues.

We are also sourcing/developing a proper head stud and other components to be able to hold the power as well. Please stay tuned! :thumbsup:
First a clutch and now this... OKAY take my money SI!!! :love::love:
 

maaaaackle

Senior Member
Joined
Dec 7, 2016
Messages
507
Reaction score
163
Location
Socal
Car(s)
Sport Hatch 6MT
Country flag
Wait.

PRL, I think your left/ride side is switched. You're tellin me that the Type R connecting rod is THINNER than an SI?

WHAAAAT?

jk. i know.
 

supaslow10g

Member
Joined
Jun 17, 2016
Messages
16
Reaction score
8
Location
Hattiesburg ms
Car(s)
2016 civic lx 6mt 05 Chevy Avalanche 2wd 2000 3G eclipse gt
should have bought a better trim......lol
and get the cvt you can't do much with and honda sensing I'll never use for 15 grand more. or pay the outrageous jacked up dealer prices I can't afford for a type r. a proper turbo kit for the lx and it'd basically be a type r under the hood plus some with a little beefier setup. and still be in it for less than 30k. I just hope someone shows some to the na 2.0 eventually. if not guess I'll have to stepup to a si now that they are putting out such serious upgrades for them.
 
  • Like
Reactions: 18k
OP
PRL Motorsports

PRL Motorsports

Premium Performance Products
Elite Sponsor
Joined
Jan 26, 2017
Messages
1,310
Reaction score
3,530
Location
Export, PA
Website
prlmotorsports.com
Car(s)
2017 Civic Si, 2016 Civic EX-T, 2018 Type R
Country flag
  • Thread starter
  • Thread Starter
  • #12
I just saw it on your instagram account. Very exciting news!

Is the block different between the SI and regular 1.5T?
The part numbers are different, but there isn't much information out there about any differences. The Si block has been rumored to be stronger, but we cannot confirm this yet. From a monetary standpoint, though, the Si block is actually cheaper than the base 1.5T block!

Also, I believe the left and right are reversed from your description.
Wait.

PRL, I think your left/ride side is switched. You're tellin me that the Type R connecting rod is THINNER than an SI?

WHAAAAT?

jk. i know.
Apparently I don't know right from left! :doh: Oops haha

stop messing with these tiny toys and build a turbo kit for those of us that bought the lx for 2.0 and stick pls lol
That is a possiblity... We will see! ;)
 

JDM_DOHC_SiR

Uncle Dave
Joined
Apr 17, 2017
Messages
928
Reaction score
1,060
Location
Chula Vista/ Eastlake
Car(s)
2012 Acura TL California Edition / 2018 Civic Si Coupe /2020 Civic Type-R
Country flag
You can still see the image but you have to click on the photobucket link... they changed their policy and reduced the storage size now to 2gb anything over that and you have to pay $$$$$:thumbsdown::doh:
 











Top