Best N/A engine?
10-30-07, 12:59 PM
#1
Best N/A engine?
I wasn't sure where to post.. but I figured 13b would best be known by the 2nd gen people..
I'm looking to discover the best N/A 13b out there..
is it the S5 because of high compression?
I want to get an aggressive street ported 13b and I'll carb it for my 1st gen..
But what block do I start with? (are there good seals for N/A power and whatnot?)
I dont know about engine building, but I imagine lots of you do
thanks!
I'm looking to discover the best N/A 13b out there..
is it the S5 because of high compression?
I want to get an aggressive street ported 13b and I'll carb it for my 1st gen..
But what block do I start with? (are there good seals for N/A power and whatnot?)
I dont know about engine building, but I imagine lots of you do
thanks!
10-30-07, 01:06 PM
#2
always modding
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P-port 3 rotor with RX8 rotors
or a P-Port 2 rotor with RX8 rotors with tall velocity stacks perched on top.. and balanced to rev out to 11,000 rpm
:p
or a P-Port 2 rotor with RX8 rotors with tall velocity stacks perched on top.. and balanced to rev out to 11,000 rpm
:p
10-30-07, 01:13 PM
#3
well.. I can dream lol..
I'd like something a little more practical, that wont cost an arm and a leg to build..
It's my DD in the summer, and a P-port will burn a hole through my wallet just in gas i'm sure..
Something that can be build out of a S4 or S5 13b?
I'd like something a little more practical, that wont cost an arm and a leg to build..
It's my DD in the summer, and a P-port will burn a hole through my wallet just in gas i'm sure..
Something that can be build out of a S4 or S5 13b?
10-30-07, 01:17 PM
#4
Engine, Not Motor
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If you want to carb something, your best bet is to build a 4 port 13B with S5 NA rotors. Port appropriately depending on your goals. If you intend on building with 6 port irons, then you are going to have a massive torque loss down low.
10-30-07, 01:21 PM
#5
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the difference between the s4 and s5 rotors is that the s5's are light and give you .3 more compression and for the housing on a N/A you have to grind out the baffles in the exhaust ports or just change them for turbo ons . so start with that, then for seals just get a seal kit with steel 2 piece apex seal and for the carb its up to you what you like. i am doing the exact same but fuel injecting it.
10-30-07, 01:36 PM
#6
If you are running a carb, then both the S4 and S5 NA engine will be running well below it's potential. The S5 especially considering most of it's power gain over the S4 is due to the VDI intake manifold. The S4 has a slightly less advanced intake manifold but it still contributes a significant amount (about 10HP over the 13B in the GSL-SE) to the overall total power.
If you want to carb something, your best bet is to build a 4 port 13B with S5 NA rotors. Port appropriately depending on your goals. If you intend on building with 6 port irons, then you are going to have a massive torque loss down low.
If you want to carb something, your best bet is to build a 4 port 13B with S5 NA rotors. Port appropriately depending on your goals. If you intend on building with 6 port irons, then you are going to have a massive torque loss down low.
you're saying if I took the S5 N/A engine.. street port and big weber..will have significantly less power than stock intake??
10-30-07, 01:58 PM
#7
Engine, Not Motor
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Running any 6 port engine with the aux ports open below 4K will result in a large loss of torque.
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10-30-07, 02:08 PM
#8
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OK i have a question after reading all this.
On my 87 I had, We wired the ports open. I didnt think it had lost that much power. What is a guess at the amount of lost torque (is that even a fair question?)?
Was i just that wrong on what I should have expected the torque to be? at the time I also had an F150 with a 302 so I may have been expecting less due to having a V8 also.
Thanks
Paul
On my 87 I had, We wired the ports open. I didnt think it had lost that much power. What is a guess at the amount of lost torque (is that even a fair question?)?
Was i just that wrong on what I should have expected the torque to be? at the time I also had an F150 with a 302 so I may have been expecting less due to having a V8 also.
Thanks
Paul
10-30-07, 02:13 PM
#11
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If you are running a carb, then both the S4 and S5 NA engine will be running well below it's potential. The S5 especially considering most of it's power gain over the S4 is due to the VDI intake manifold. The S4 has a slightly less advanced intake manifold but it still contributes a significant amount (about 10HP over the 13B in the GSL-SE) to the overall total power.
If you want to carb something, your best bet is to build a 4 port 13B with S5 NA rotors. Port appropriately depending on your goals. If you intend on building with 6 port irons, then you are going to have a massive torque loss down low.
If you want to carb something, your best bet is to build a 4 port 13B with S5 NA rotors. Port appropriately depending on your goals. If you intend on building with 6 port irons, then you are going to have a massive torque loss down low.
10-30-07, 03:33 PM
#14
This question really depends on your budget and intended use for the car.
For a street car, a streetported n/a in an FB can be a ton of fun. A buddy of mine ported a S4 and put it in his 79 running S4 electronics (carb bad) and it was a hoot. You could break the rear end loose in the first three gears. It ran a 13.8 in the 1/4 mile too. The whole swap cost less than $1000 (remember to use a gslse front cover to make it easy).
Josh
For a street car, a streetported n/a in an FB can be a ton of fun. A buddy of mine ported a S4 and put it in his 79 running S4 electronics (carb bad) and it was a hoot. You could break the rear end loose in the first three gears. It ran a 13.8 in the 1/4 mile too. The whole swap cost less than $1000 (remember to use a gslse front cover to make it easy).
Josh
10-30-07, 04:08 PM
#15
To give you some perspective I just built a 4 port engine for a customer that put out 216bhp @ 7000 rpm.
Specs are as follows:
'89 4 port irons
86-88 High Compression rotors (read NA)
One of our largish street ports
"Oval" street exhaust ports
The carb we used was a 48 DCOE SP, with a 45 DCOE 9 we put out 194bhp @ 7000 rpm.
Oh, we had ~141 torque by 3000, peaking at 6000 with 166. This engine had more power to be had with more revs.
Specs are as follows:
'89 4 port irons
86-88 High Compression rotors (read NA)
One of our largish street ports
"Oval" street exhaust ports
The carb we used was a 48 DCOE SP, with a 45 DCOE 9 we put out 194bhp @ 7000 rpm.
Oh, we had ~141 torque by 3000, peaking at 6000 with 166. This engine had more power to be had with more revs.
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