2.1 destroked or 2.4 stroker?
I believe the 2.4 is the upperclass. I have a galant with the 2.4 in it, so I'm going to just build the engine with and evo 8 head and make it awd while I'm at it lol. So what would be the ideal c/r for e-85/ 91 octane?
Are you in the Rapid area?
Are you in the Rapid area?
I decided to go with the 2.1 with a 10:1 CR and believe I made the right choice frm what ive been reading.I have a 6262 and plan to go bigger with maybe a 6766 and since the only racing I will ever do is drag i felt the 2.1 was a better choice over the 2.4
What kind of lifespan do you give these engines before you pull them down?
Are they used for any circuit work, or only street/drag engines?
Cheers, Mike
Hey Mike. I would rev a 2.4lr to 8800 on autox. I would like to say it would still hold up but I don't know of anyone that has done that. For street/drag 8800 is not a problem. If I go to a 3794 in the future my motor will rev still it stops making power...
Regarding piston speed, take a look at what the gsr piston speed is at 10k. It is almost the exact same as the 2.4lr at 9k (ill go double check math when I get back to my computer) and people with sleeved gsr motors rev them to 10k from stop light to stop light without problems. There for I don't see a problem with the 2.4lr doing the same. There is also a difference between peak and mean piston speed. Peak is based off of the 100mm crank and yes it become F1 around 8400. However with the longer rod it lowers the mean piston speed to a more bearable number. Regarding peak piston, mean piston speed, side loading properties, and rotational mass at 8800 put it at a cat 3. If you have the cam and head cfm you can rev the 2.4lr over 9k. Look at Kevin kiggly who revs a std rod 2.3 to 9600 and has so for the past 3 seasons
Mikey
Regarding piston speed, take a look at what the gsr piston speed is at 10k. It is almost the exact same as the 2.4lr at 9k (ill go double check math when I get back to my computer) and people with sleeved gsr motors rev them to 10k from stop light to stop light without problems. There for I don't see a problem with the 2.4lr doing the same. There is also a difference between peak and mean piston speed. Peak is based off of the 100mm crank and yes it become F1 around 8400. However with the longer rod it lowers the mean piston speed to a more bearable number. Regarding peak piston, mean piston speed, side loading properties, and rotational mass at 8800 put it at a cat 3. If you have the cam and head cfm you can rev the 2.4lr over 9k. Look at Kevin kiggly who revs a std rod 2.3 to 9600 and has so for the past 3 seasons
Mikey
Last edited by Mikey@Spec-Ops; Oct 3, 2011 at 09:25 AM.
Our motors are very strong. With I beams and a light piston we should rev them to the moon. I'm not going to talk about longevity because I don't know of a single 2.4lr that has blown up due to high revs. I will say my rod bearings have been changed every 12k with wear... but high hp/tq and timing comes into play with rod bearings. Can't reallysay how much wear is due to 8800 rpm but I would say minimun.
I have 19 months of hard abuse on my motor and still running strong. I may be starting to get some blow by but my motor was a lose build to begin with. I'll rebuild it before the next shootout and it will be a longer rod setup and higher compression.
2.4lr for life
Mikey
I have 19 months of hard abuse on my motor and still running strong. I may be starting to get some blow by but my motor was a lose build to begin with. I'll rebuild it before the next shootout and it will be a longer rod setup and higher compression.
2.4lr for life
Mikey
I can't decide on the MAP stage2 2.1 or 2.4 , My turbo would be 6766 or 6266 , the car is just for street racing , I'm looking for 800-850whp on 40-45psi . so whats you recommendations on that ?
Mikey
most standard 2.3L blocks are recommended up to 8500RPM. BR's 2.3L is recommended 9500RPM. so there has to be some changes somewhere.
the OP said he wants to use a 6766 turbo. while a stroker will spool it up faster then a standard 2.0 L i would think your going to need more RPM then a 2.4L can deliver ''at the drag strip''. or IMO even on the street.
i may be talking out of my butt because i have no personal stroker engine experience. i just thought it was worth considering BR's 2.3Lrpm VS a regular 2.3L
im not sure bud. i do not know the differences other then what he as posted. he uses a lighter crank and custom BR spec pistons for those 2/3 RPM blocks. as for rods and such i dont know.
most standard 2.3L blocks are recommended up to 8500RPM. BR's 2.3L is recommended 9500RPM. so there has to be some changes somewhere.
the OP said he wants to use a 6766 turbo. while a stroker will spool it up faster then a standard 2.0 L i would think your going to need more RPM then a 2.4L can deliver ''at the drag strip''. or IMO even on the street.
i may be talking out of my butt because i have no personal stroker engine experience. i just thought it was worth considering BR's 2.3Lrpm VS a regular 2.3L
most standard 2.3L blocks are recommended up to 8500RPM. BR's 2.3L is recommended 9500RPM. so there has to be some changes somewhere.
the OP said he wants to use a 6766 turbo. while a stroker will spool it up faster then a standard 2.0 L i would think your going to need more RPM then a 2.4L can deliver ''at the drag strip''. or IMO even on the street.
i may be talking out of my butt because i have no personal stroker engine experience. i just thought it was worth considering BR's 2.3Lrpm VS a regular 2.3L
The lighterweight parts (rotational mass) will allow you to rev the motor higher and with a loser clearance as well. To say that 9500rpm is safe is a 2.3rpm is probably pretty close. I would take a std 2.3 to 9000rpm as long as the head can flow the cfm that the motor requires. Most people have no need to rev over 9000rpm and at the point you are not worried about 2.3 vs 2.3rpm vs 24lr but more so the cfm of the head and oiling/bearing issues. For an average Joe, your motor should never go over 9000rpms unless it is fully built and designed to. There is a lot more that you have to think about when reving over 9000rpm than just the block.
I'm also going to step out on a limb and say the 2.3rpm is to spec that Kevin Kiggly runs in his car. With everything being equal: Large cams, correct head flow, turbo, block, drivetrain, clearances, etc... Yes the RPM can rev to 9500 but so can a 2.4LR.
Mikey
You are correct. To my knowledge, David uses a billet Manley crank and lightweight pistons. The rods are still 150mm I am assuming. Reason being, it would be extremely hard to put a longer rod in a 4G63 Block. A 153 rod may be possible but again you would have to move the wrist pin 3mm up on the piston and that would make it weaker than I would like to play with and knowing David, I'm sure he would agree with me 100%...
The lighterweight parts (rotational mass) will allow you to rev the motor higher and with a loser clearance as well. To say that 9500rpm is safe is a 2.3rpm is probably pretty close. I would take a std 2.3 to 9000rpm as long as the head can flow the cfm that the motor requires. Most people have no need to rev over 9000rpm and at the point you are not worried about 2.3 vs 2.3rpm vs 24lr but more so the cfm of the head and oiling/bearing issues. For an average Joe, your motor should never go over 9000rpms unless it is fully built and designed to. There is a lot more that you have to think about when reving over 9000rpm than just the block.
I'm also going to step out on a limb and say the 2.3rpm is to spec that Kevin Kiggly runs in his car. With everything being equal: Large cams, correct head flow, turbo, block, drivetrain, clearances, etc... Yes the RPM can rev to 9500 but so can a 2.4LR.
Mikey
The lighterweight parts (rotational mass) will allow you to rev the motor higher and with a loser clearance as well. To say that 9500rpm is safe is a 2.3rpm is probably pretty close. I would take a std 2.3 to 9000rpm as long as the head can flow the cfm that the motor requires. Most people have no need to rev over 9000rpm and at the point you are not worried about 2.3 vs 2.3rpm vs 24lr but more so the cfm of the head and oiling/bearing issues. For an average Joe, your motor should never go over 9000rpms unless it is fully built and designed to. There is a lot more that you have to think about when reving over 9000rpm than just the block.
I'm also going to step out on a limb and say the 2.3rpm is to spec that Kevin Kiggly runs in his car. With everything being equal: Large cams, correct head flow, turbo, block, drivetrain, clearances, etc... Yes the RPM can rev to 9500 but so can a 2.4LR.
Mikey
2.1L 4g64 with 6766 to go with...c wat Ams has build on their drag evo... It either 2.1 or 2.4LR ftw..seen a 2.3 try to run with gt42....so much dissapointing then run on gt35
Evolving Member
Joined: Sep 2002
Posts: 198
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From: Italy
I'm currently using a borg warner s400sx71 on a std 2.3 stroker, it revs no problem at 9300 rpm, if the head is built correctly i don't see a single problem to run a 42 on a 2.3..... And using a twin scroll system i have a torque/power curve not too far from a gt35r equipped stroker engine, with the little difference that with the s400sx i'm making 960 hp.....
My next engine, built for drag purpose, will be for sure a 4g64 2.4 lr, maybe looking at lightweight titanium conrods and a 4 counterweight winberg crankshaft for revving easier, for me "there's no replacement for displacement" is pure truth.....
My next engine, built for drag purpose, will be for sure a 4g64 2.4 lr, maybe looking at lightweight titanium conrods and a 4 counterweight winberg crankshaft for revving easier, for me "there's no replacement for displacement" is pure truth.....