13b series 4 engine non turbo questions?

cmybug · 06-06-2016, 11:07 PM

Hi there guys/gals,
im glen from Australia and new member here.
I recently just brought a complete running 13b series 4 non turbo 6 port engine for $800 aus!
came with 3 month warranty.

now im finding out that this series 4 13b 1988 non turbo engine is not very good to build with !?

some rotary shops here in oz are saying im waisting my time with this engine ?

why is is this ?
im hoping this statement could be wrong!

my plan was to add a 48 mm ida weber,a good flow exhaust,bridgeport it and lighten,balance and blue print it!

is there anything that can be done to modify and make this engine into some thing good?

do any of you guys have on here good experience and results with this engine please ?
what sort of power can be made out of this engine please ?

I want to keep this engine non turbo!

also I have heard guys saying before you can add two stroke pre mix oil in with your fuel to help lubricate and protect the engine better ?

would luv to here your thoughts on this pls!
kind regards
glen

cmybug · 06-07-2016, 03:33 AM

well,can any one pls help advise me ?! :O

t_g_farrell · 06-07-2016, 07:20 AM

Dude, it was midnight here when you posted. Have patience. Someone will probably come
along today and answer you.

chibikougan · 06-07-2016, 02:54 PM

Here are the Manuals good luck..

infernosg · 06-07-2016, 03:35 PM

My understanding is the issue stems from the extra secondary intake ports. In stock form they are actuated; closed at low engine speeds and open at higher speeds. The S4 engines use exhaust pressure whereas the S5 engines use the air pump to actuate rotating valves to open the ports. My understanding is potential is limited because the ports are too big to be left open all the time and too small to be left closed. There are isn't much metal remaining between the ports and coolant passages so you can do only so much with standard porting. If you leave the auxiliary ports open at all times and combine that with a bridge port I imagine you'll end up with an engine with a very "peaky" power band.

Most people going for the most power in a naturally aspirated configuration, myself included, start with turbo motors.

speedjunkie · 06-08-2016, 01:18 AM

Quote:

Originally Posted by chibikougan

Here are the Manuals good luck..

Incorrect.

HERE are the manuals.
http://foxed.ca/index.php?page=rx7manual

lol

cmybug · 06-08-2016, 01:43 AM

thanks guys for your reply and imput!
I heard that peripheral port could be the go to build my series 4 6 port ?
regards
glen

***TitaniumTT*** · 06-08-2016, 08:17 AM

P-Ports will give you the most hp without a doubt, but that opens up a different can of worms regarding apex seals, and clearances. P-ports love to rev so now you're looking at machining the rotors and building the rotating assemble to the highest of standards.

regarding the pre-mix, yes. Always a good idea with these engines

06-06-2016, 11:07 PM	#1
cmybug The Newbie Join Date: Jun 2016 iTrader: (0) Posts: 3 Rep Power: 0	13b series 4 engine non turbo questions? Hi there guys/gals, im glen from Australia and new member here. I recently just brought a complete running 13b series 4 non turbo 6 port engine for $800 aus! came with 3 month warranty. now im finding out that this series 4 13b 1988 non turbo engine is not very good to build with !? some rotary shops here in oz are saying im waisting my time with this engine ? why is is this ? im hoping this statement could be wrong! my plan was to add a 48 mm ida weber,a good flow exhaust,bridgeport it and lighten,balance and blue print it! is there anything that can be done to modify and make this engine into some thing good? do any of you guys have on here good experience and results with this engine please ? what sort of power can be made out of this engine please ? I want to keep this engine non turbo! also I have heard guys saying before you can add two stroke pre mix oil in with your fuel to help lubricate and protect the engine better ? would luv to here your thoughts on this pls! kind regards glen Last edited by cmybug; 06-07-2016 at 12:06 AM..

06-07-2016, 07:20 AM	#3
t_g_farrell Waffles - hmmm good Join Date: Aug 2008 Location: Huntersville, NC iTrader: (0) Posts: 757 Rep Power: 0	Dude, it was midnight here when you posted. Have patience. Someone will probably come along today and answer you. __________________ 1980 GS stockport, Fat Nikki, RB Dual Facetfuel pumps, Holley regulator, RB Street port exhaust, 2GDFIS, MR2 MK I electric fans, 2G strut bar, relayed fans, lights and fuel pump, LEDs Project Fat Nikki Budget 12A rebuild Video setup < $30.00

06-07-2016, 03:35 PM	#5
infernosg IT'S ALIVE! Join Date: Dec 2009 Location: Richmond, VA iTrader: (5) Posts: 811 Rep Power: 15	My understanding is the issue stems from the extra secondary intake ports. In stock form they are actuated; closed at low engine speeds and open at higher speeds. The S4 engines use exhaust pressure whereas the S5 engines use the air pump to actuate rotating valves to open the ports. My understanding is potential is limited because the ports are too big to be left open all the time and too small to be left closed. There are isn't much metal remaining between the ports and coolant passages so you can do only so much with standard porting. If you leave the auxiliary ports open at all times and combine that with a bridge port I imagine you'll end up with an engine with a very "peaky" power band. Most people going for the most power in a naturally aspirated configuration, myself included, start with turbo motors. __________________ '86 Mazda RX-7 Base '79 Mazda RX-7 GS

06-08-2016, 08:17 AM	#8
*TitaniumTT* Test Whore - Admin Join Date: Mar 2008 Location: Right Behind you son iTrader: (4) Posts: 4,581 Rep Power: 10	P-Ports will give you the most hp without a doubt, but that opens up a different can of worms regarding apex seals, and clearances. P-ports love to rev so now you're looking at machining the rotors and building the rotating assemble to the highest of standards. regarding the pre-mix, yes. Always a good idea with these engines __________________ -The Angry Stig- DGRR 2009, 2011, 2012 & 2013 - Best FC DEALS GAP!! WOOHOOOO!!!!! 2015 Audi S4 - Samantha - Zero Brap S4 2004 RX8 - Jocelyn - 196rwhp, 19mpg fuel to noise converter 2000 Jeep Cherokee Sport - Wifey mobile - Now with 2.5" OME lift and 30" BFG AT KO's! So it begins 1998 Jeep Cherokee - 5 spd, 4" lift, 33" BFG's - Rotary Tow Vehicle 1988 'Vert - In progress 1988 FC Coupe - Gretchen -The attention whore BEAST! I'm a sick individual, what's wrong with you? I'm pure Evil I'm still insane, in the best possible way. I think Brian's idea of romance is using lube. Your rage caused the meteor strike in Russia. The Antichrist would be proud of his minion. You win with your thread. Most everything It's a truck with a steel gate on the back. Just a statement of fact Motec M820, AIM dash, ported 13B-RE Cosmo, 6-spd trans, 4.3 Torsen, custom twin wg fully divided mani, Custom 4" split into 2x 3" exhaust, Custom HMIC, Custom custom custom custom I like to welder stuff.... No Bolt-ons allowed. Dyno'ed @ Speed1 Tuned by me - 405rwhp on WG.... WM50 cuming soon. *-Angry Motherfcker Mode ENGAGED-**

06-07-2016, 03:33 AM	#2
cmybug The Newbie Join Date: Jun 2016 iTrader: (0) Posts: 3 Rep Power: 0	well,can any one pls help advise me ?! :O

06-08-2016, 01:43 AM	#7
cmybug The Newbie Join Date: Jun 2016 iTrader: (0) Posts: 3 Rep Power: 0	thanks guys for your reply and imput! I heard that peripheral port could be the go to build my series 4 6 port ? regards glen