Recent Dyno Test and Tune : B20vtec

Around December 20 @ 4:12pm (was hot and uber humid!) we had scheduled a dyno for the following:

B20vtec with the following specs

PR3 head : ported and developed by us, OEM valves *no flat faced ferrea here
                 Supertech HDR springs and retainers
B20b block : 1up pistons (like ycp cast pistons with dome) ARP rod bolts on oem stock rods

Skunk2 Pro 2 camshafts : 0.493"/0.458" Lift (intake/exhaust)   258*/265* dur@0.050" (in/ex)

Intake : ITR intake manifold w/ 68mm cast style throttlebody

Exhaust : SMSP style 4-2-1 long tube tri-Y header w/ 24inch resonator (not open exhaust)

Compression is 11.8:1 (running on 93RON) thats about 89 u.s. octane for our U.S.A  friends UNLEADED!

*a typical street/daily driver set-up we can find universally around the globe hehehe

below are the pictures of the build and last is the dyno run's view :)

a view of the intake ports : the lighting shows the proper contours and shape we have achieved on the port sidewalls, the divider and including the short turn... without totally hogging out the port

a beautiful view of the exhaust ports, streamlined without the need to overly port the sections this lets us maintain excellent port velocity for improved torque at the very least

The reason for the final re dyno was a re work of the ITR intake manifold we have ported it including the plenum section + further re did the work for more improvements and based on previous results

At this angle you can clearly see excellent runner entry shape and the reason for the "rework" was based on previous dyno's we have learned substantial things... i guess that classifies a legit "R&D"
aka research and development LOL :P

a Picture of the header we used (the same design ofcourse this is still new)  foreground is the Bseries header, and on the background (upside down) is a sohc version of our Tri Y 4-2-1

The dyno achieved in Thursday December 202018
noticee the torque/hp improvements between 4,000-5,000rpm justifies the improved runner shape and intake manifold porting = makes for an excellent dailydriver!!

interestingly the curve around the 9,000rpm mark does not show a drastic power drop it seems its still "trying" to carry it onwards, and it reflects not just on the hp but also torque curve, interesting!

we have learned and found out we have sort of maxxed out the ITR plenum size :(
...while the ITR runner shape + added taper via porting was excellent and working well, we feel with better plenum volume (more volume)  we could see significantly more peak power gains...

i guess this is where the Edelbrock PerformerX shines where a VictorX might hurt our midrange...

interesting eh?

so Stay Tuned for more work from us @ SRDmotorsports but we hope you enjoy this update

and Merry Christmas to all!!! cheers!

A proper B20vtec (oem style) project for Mac

Owner had a first gen B16a swap installed to his Eg civic hatchback... and whilst the engine bay was repainted and needing the usual and typical high mileage maintenance, the owner figured going to a b20 vtec would be sensible (cost wise)

set-up is comprised of :

- B16a Cylinderhead : ported and developed by us + CTR/ITR dual springs installed
  new oem honda valveseals + camseal and machine decked surface making this head "new" in condition

-B20b Block : Rebuilt and refreshed with New oem daido/taiho main and rod bearings, ARP rod bolt  fastener upgrade, Bnew 1up Pistons (similar to YCP style) but this 1up piston is based on a derived design off the ARIAS 7.4cc dome pistons on p3h piston geometry so it sits 0.030" below which is okay for pump
* proper main bearing oil clearance is achieved and done
*proper rod bearing oil clearance is achieved and done aswell...
*proper ARP tightening sequence of "stretch" vs just simply torquing them
*our own custom made steel braided vtec oil line and fittings

-Intake manifold : OEM p30 b16a intake manifold we have ported and had the plenum cut, to let us port the  proper intake runner radius and shape then tig welded back shut this motor will be a torque monster :)

-Exhaust : stainless copy of a ctr/itr 4-1 header

some "OEM" flavor upgrades and some aftermarket are

-Camshaft : B18c1 cams which are significantly meatier than the second gen b16a cam and significantly  beefier than a first gen b16a cam (which the owner had) As mentioned above we have thrown in a ctr/itr  dual spring upgrade to insure safety

-Camgears: Skunk2 ProSeries adjustable camgears to let us tweak the powerband to where it likes it best

-Target Compression ratio is 12.4:1 which is perfect for our 95ron pump gas

-Will run on obd1 P06 rechipped ecu by Ecu_later, and tuned via Crome

next are photos of the project :

 Here we have a shot of the 1UP pistons and ARP rod bolt fasteners,
and the second shot is of the rods itself pressed on the 1up pistons (dont mind our rare 36idf carb in the background haha)

Next is a sneak peek of our portwork done on the venerable P30 b16a OEM (stock) intake manifold
the entry are carefully radiused to improve its efficiency and increase excellent air speed, all of which helps generate better torque earlier and carry it longer

A view of the 1UP piston domes peaking out :) notice the deck it sits 0.030" below so this will suit even the GSR style chambered heads and give significant piston to valve clearance since it is Arias based giving it ample room even for 1mm oversized intake valves should you need that.

We pride in installing the ARP rod bolts as how they prefer it, via the "stretch" method so here is our indicator showing the proper stretch which arp calls for 0.005-0.0055" and we are in the window

 Here is a shot of the p30 intake manifold fully welded, and the Steel braided vtec oil line layed on top of it... and slightly below it is the new ARP rod bolt before we installed it (sorry for that mess LOL)

A nice shot of the intake port we did, the keen eye will notice the port itself isnt entirely hogged out
this promotes excellent airspeed and torque generation

A nice angled shot showing how the short turn blends well with the port side walls and the port divider itself

A shot of what the injector see's  aka the Money Shot  LOL

The finished b20vtec OEM style refreshed into a "new" condition
in reality this is a zero mile motor as it sits on the stand, virtually it hasnt seen any miles yet.
So the owner will enjoy this as if its Bnew :)

Another shot with a slightly better view of the skunk2 Proseries camgears
that is the only hint that it is beyond "stock" in rebuild status

we will keep you posted as soon as the owner gets some miles and have it tuned with us.

*as it stands, the civic hatchback is waiting for paint curing on the engine bay then they can have the engine installed as soon as possible...

Stay Tuned!

GT100 class (project d15b vtec)

The GT100 class in our region is all about being rated at 100whp

which is a smart rule.. compared to "parts" or "mods" limiting class...
here you are free to modify anything but do not exceed the gt100 power rate...

so our smart idea is to generate the most torque and hp on a motor... and once dynoed
try to tune the peak power to be limited at 95-98whp   this way the torque generation is still at max and only the peak power is limited... we dont se no torque limitation rule right? :)

our set up will comprise of: :

-d15b head (d16z6 in other locations in the world lol)
 ported and improved flow for max efficiency

-d15b block fully blueprinted, static balanced pistons, achieved proper oil clearances on the main and rod bearings, ARP rod bolt upgrade for improved durability and reliability

-Induction : p08 factory intake manifold, fully port matched to improve flow efficiency and possibly run a Cold Air Intake (CAI) as we have noticed due to its harmonics benefit (intake length) there is substantial boost in hp and torque at around 4-4.5k rpm...  this will help us achieve improved benefit on roadrace applications

-Exhaust : 4-2-1 long primary tube design header which we have used on numerous projects, this design lay out has proven to be efficient in the mid range and even top end... and much credit to SMSP aka Dave Stadulis for coming up with this design, we figure to thank the originator since his introduction of the design ages ago compared to now.. it has been mimic'd countless times...
thanks to Stadulis Motor Sports Products (the true meaning behind the smsp name)

so on to our update :)

Here we have a d16z6 head  about 70% ready (just pending machine works and multi-angle valvejob)
after the iniitial wave of port work and cylinderhead development

 a view of the 4 intake ports in the shot above

Here the exhaust port view of the flange side header mating area

an excellent view of the exhaust port with good efficiency being the goal and task...
an efficient exhaust port means not totaly hogged out for volume while maintaining an excellent streamlined shape for improved exhaust port velocity... the faster exhaust exit speed the better torque the engine can generate (better means earlier too.. in the rpm range)

a fun shot at the intake side port of the head and its well "matched" intake manifold for excellent transition of flow from intake runner to intake port itself... while the goal isnt improved fuel consumption or fuel economy here...   the more efficient the head performs  means more power per fuel consumed...

stay tuned for more updates guys!

With the slowing down of "forums" and the current trend of social media (fb) not giving the benefits we all once had via the forums... i believe it is time to bring back some activity as blogs...

a little update, sometime around the 17th of February 2018 our main guy (me) was involved in a car accident while no physical injuries were incurred (blessed and lucky) supposedly on the first impact i hit my head and i was knocked out...  experiencing Traumatic Brain Injury (TBI) is a bummer.. and the depression rate is quite high... none the less we are all lucky to be here...

so now.. back to updating this blog to bring back the old "forum" feels

from our last blog update here (roughly 6yrs ago wow) we have built almost more than a hundred engines and heads.. including happy customers in Australia, Norway, Ireland, Austria and The US of A...

pls feel free to track our activity and like our fb page  https://www.facebook.com/SRDms/

we have some fun upcoming project builds to share!
including a GT100 class engine project (sort of like a class11 vw scenario but road race and honda)

stay tuned!