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!
Saturday, December 22, 2018
Sunday, December 16, 2018
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
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!
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
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!
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