Planning to upgrade my stock internally JDM Type R motor's valvetrain, retainers and camshafts so I'll make power up to around 9500rpm's. The motor currently has the usual bolt ons (I/H/E, plus clutch/flywheel) and is daily driven though drove real hard during race season on the drag strip. Should I have any concerns revving to 9500 constantly on the stock 11.1:1 ITR block? If so, what do you suggest I upgrade on the block in order to rev every shift at 9500 R's safely?

 

Don't think you can with those stock rods & bolts...Also, make sure that you're making power at that rpm. Reving it up that high for nothing is just a waste of a good motor...my .02

 

My mates B18'd engined crx made 236@ the flywheel on a dyno with ITR cams and a good head job.

The peak power was made at 7700rpm, so there's really not much need to rev well past where ur gonna make peak power

 

Well I'm planning on upgrading the components in the head...Idealy I'd like to be safe to rev that high, though I'd really only expect to make power to 9K. But, if the block will hold 9500rpms, then I wouldn't have to worry about 9k...get what I'm saying? I know the block will hold 9K cause I'm shifting around 8700 now, so whats another 300 rpms...plus CTR's rev to 9K stock so I'd assume I would be fine revving to 9K on a stock block all day long.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by erics99si &raquo;</TD></TR><TR><TD CLASS="quote">Well I'm planning on upgrading the components in the head...Idealy I'd like to be safe to rev that high, though I'd really only expect to make power to 9K. But, if the block will hold 9500rpms, then I wouldn't have to worry about 9k...get what I'm saying? I know the block will hold 9K cause I'm shifting around 8700 now, so whats another 300 rpms...plus CTR's rev to 9K stock so I'd assume I would be fine revving to 9K on a stock block all day long.</TD></TR></TABLE>

is not just to rev to 9500 , you also want to make sure that your motor power band is still going and not dropping . On stock itr valvetrain i wouldnt do it , even 9000 is pushing it . rods the same way i wouldn go pass 9000rpms on stock itr rods. also on stock 11.1CR it seems pointless with stock cams .(unless you have jun , skunk or toda )
My motor makes power at 9500rpms and peak is at 9000 maintaing power throught 9500. my motor with no problem will hold safetly till 10k but theres no reason to rev that high unless i go up on the CR to make more power on it . which is already at 12.5CR , in the future i will upgrade to 14.1CR and take it to 10k but mean while 9500 is more then enought.

 

9000-9500 Rev's WOULD NOT be with the use of stock ITR valvetrain or cams. I'm planning on running a upgraded valvetrain (portflow/JUN/ef-1's "haven't decided yet") and either JUN3's or ef-1 camshafts... I"m doing all my research right now before I make the final decission and purchase. With whatever valvetrain and cams I choose, I should make power up to at least 9K (obvioulsy I'd shift where the powerband stopped, you're right...why rev to 10k if your power stops at 8K). Correct me if I'm wrong, but what your saying is if I want to safely rev and make power at or above 9K on my JDM R, I'll have to at least change the factory rods though the rest of the factory block internals will be fine. I've been under the ussumption(sp?) that the factory block internals would hold 9K no prob since the CTR's rev to 9K stock.

 

the factory internals of the JDM R can hold up to 9k but no higher than that... even on roadracing applications where they dwell between 8.5k to 9k...

 

cool, so with bigger cams and stronger valvetrain I should be alright to rev to 9k daily on a consistant basis.

 

on a consistent basis like road racing or hard street driving it would be good to invest in a bigger oil pump gear and possibly an oil cooler assembly, along with the above, so that the engine will perform better under such stress, which in turn increases reliability... then you can really flog this engine to 9k like nothing...

 

great info...finally someone thats answering the thread question..

 

9k your bottom end should be fine , but pass that you would be putting to much stress
you were asking to 9500 rpms if it was safe on a regular basis and that would be no

 

reving any motor to 9500rpm's on a daily is not safe......you first of all need to dyno the car to see where your peak HP is located. Then if you can decide where your shift points will be ....upgrading your oil pump gear is a good investment...we have seen many motors go kaboom because oil pump gears shattering.......as far as upgrading...like i said oil pump gear and of course im going to be bias ....SLEEV THE BLOCK .........no more worries after than

 

What oil pump gear upgrade do you recommend? What's the average going rate?

 

The pro-drive oil pump gear is preety good...not sure of the price of the pump

 

toda is also a good one...

 

ive heared the prodrive gears break. that would suck if it broke on you. i think that the stock pump is fine for 9500, since my b16 has been to 10,000-12,000 a bunch and the pump is still working but what i really want to invest in, is one of the fluid harmonic dampeners.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by johnzm &raquo;</TD></TR><TR><TD CLASS="quote">ive heared the prodrive gears break. that would suck if it broke on you. i think that the stock pump is fine for 9500, since my b16 has been to 10,000-12,000 a bunch and the pump is still working but what i really want to invest in, is one of the fluid harmonic dampeners. </TD></TR></TABLE>

Whats done to it ? about b16

 

it will hold fine ive reved those motors to 10rpm all day long just get some valve springs and jun3

 

Im just speaking from experience...we have taken apart alot of motors that have spun bearings....alot of people just think they spun a bearing but alot of times they shatter a pump gear which leads to major problems.... people really dont check the pump gear after they blow up ...they just change it and keep rolling

 

So what oil pump gear are the big guys running

 

Definetly not recommended!!

 

Definetly not recommended!!
daily.....

 

Man this is great, I got a JDM R in my HB and i've been wondering about all this info. Cause my redline right now is at 9.1k. So in order for this do be more efficient i need to upgrade the valve train, rods, & cams. Then also get the ol pump and oil cooler? YOU think thtas all i'll need.

 

actually in my experience the stock rod bolts hold really well in 9k dwellings... then again i run a b16 which has lower stroke and piston speed than a b18...