well im having a hard time finding a f20b with a real 5 speed motor for a good price


BUT i found 3 f20b with no tranny (auto motors) for 1500 bucks canadian

so they way i fuguer the cheapest i can find the 5 speed is about 3500 canadian

now i have itbs to go on this so i dont care about the smaller throttle body and as far as the smaller cams go for the money im saving i could get some crower stage 3 cams and be done with it .......the tranny isint a big deal except it has LSD but the ratios arnt anyhting special ......as far as i know the 4th jdm has shorter ratios

i wounder if there was any thing else that made the 20hp diffrence ..any thoughts


Modified by machine4321 at 9:07 PM 11/30/2004

 

As far as I remember it the Auto F20B has smaller TB, less agressive cams, the springs are weaker than the SiR-T and a different ECU with different tables. The SiR auto ALSO has a redline at 7500 where the SiR-T has it at 8000rpm. SO if the SiR-T maintains the same torque at a higher RPM it makes more power. That can account for the difference.

Pirate

 

cool so by replacing the the cams and springs retaniers...ecu of course

ive got individuals so im not concered about the tb being smaller i should have a better then 5 speed motor right ...i assume there built just as strong but i could be wrong

 

Talk to Jdogg I think he has been through a couple of those motors. He might be able to help.

Pirate

 

true .....ill i mhim

thanks for the help ..i hope im on to somthing

 

up

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PirateMcFred &raquo;</TD></TR><TR><TD CLASS="quote">As far as I remember it the Auto F20B has smaller TB, less agressive cams, the springs are weaker than the SiR-T and a different ECU with different tables. The SiR auto ALSO has a redline at 7500 where the SiR-T has it at 8000rpm. SO if the SiR-T maintains the same torque at a higher RPM it makes more power. That can account for the difference.

Pirate</TD></TR></TABLE>

Both the Auto and the Manual ECUs have the same fuel cut @ 7700 rpm.

 

looks liek the only difference is the stuff already talked about ...hopefully that is it .

i realy cant see honda changing to much stuff just for an auto

 

up

 

the auto f20b also has a thicker head gasket than the manual

 

really damit .....howd you find that out

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by weak16teg &raquo;</TD></TR><TR><TD CLASS="quote">the auto f20b also has a thicker head gasket than the manual</TD></TR></TABLE>
Nonsense. Both engines has 11:1 compression ratios.

 

makes sence ....wondered why they would change that

 

To add to your post machine4321, I'd like to show the honda port and polish job done on F20Bs.

 

smoother port casting


valve job





Modified by MUGEN_CF4 at 12:18 AM 12/23/2004

 

Look how beefy the girdle is. Good enough for 9000+ rpms.




Modified by MUGEN_CF4 at 12:19 AM 12/23/2004

 

Wow, that is beefy.

 

wow i cant thank you enough for these pics....

and dam that is a beefy girdle ..

valve job looks almost aftermarket


if you have any more pics please post them or im me and ill give you my email ...

thanks alot

 

I assume these F20Bs will be out of a CF4 Accord?

If so, the automatic engine will produce 180HP (Factory figures), whereas the manual version produces 200HP (Factory figures also)

Never knew they are worth so much. My friend has been trying selling his F20B with low-ish kms (Under 50000kms) with everything needed for a conversion, 5 speed manual box with factory LSD included as well for more than half a year but noone wants it. He's asking NZ$1500 over here. Which is about US$1050 if I am not wrong.

 

im all over that
1st dibs

 

The motor in the picture is from an automatic car (Accord SiR). So I guess all F20Bs come from Honda with a valve job.


Modified by MUGEN_CF4 at 10:03 PM 12/22/2004

 

I took these pictures at my engine builder/tuner, where Accords come in all the time. I've seen both automatic and manual motors dyno back to back in stock form for a baseline, and both motors basically make around the same power factoring drivetrain losses of manual and automatic trannies. The SiR-Ts do have a bigger throttle body, and slightly bigger vtec lobes, and I speculate ecu mapping, but that's about it.

 

Modified by MUGEN_CF4 at 12:19 AM 12/23/2004

 

Modified by MUGEN_CF4 at 12:20 AM 12/23/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by MUGEN_CF4 &raquo;</TD></TR><TR><TD CLASS="quote">
Nonsense. Both engines has 11:1 compression ratios.</TD></TR></TABLE>

if that where the case then why does the auto put out smaller #'s. it cant be just the cams