Jump to content
SAU Community

Recommended Posts

6 hours ago, The Bogan said:

What HP does the MPH/ET/ Weight and stuff say, those Moroso calculators are pretty accurate for a rule of thumb ball park figure...

With that ET and MPH, plus a guestimated weight of 4000 lb (1800kg), an online calculator gets 1680 hp at the fly, so after removing drive train loss of, let's say 20%, 1340 hp atw

http://www.wallaceracing.com/et-hp-mph.php

When used against the dunnydores MPH and typical weight and drive train loss of 20% the calculator is pretty close to my old boat. 

Both the above calculator and a Moroso one we used at Autotech gave typical results.

Unless they used a different Moroso calculator than what we used to get the 1900hp???

Opinions may vary 

Hi All,

installed the camshaft in my rb30 and was in the process of installing the rockers and rocker plate. Cylinder 4,5,6 was all smooth and the plate sat flat for the rocker to bolt in, but with cylinder 1,2,3 the rocker plate doesn't sit flat ??

wngine is at TDC piston 1 and 6 are at the highest point. Do I just start to bolt the plate down apply pressure until it sits flat or do I have to rotate the crankshaft until the rocker plate sits flat? 
 

any help would be appreciated.

thanks 

Based on that description it's hard to know what the problem is.

Tdc could be on the exhaust stroke on the compression stroke. Either way bolting down the rockers will be easy on some spots and harder on others due to some valves being open and therefore you are compressing the springs  when tightening the rockers down.

Are you using a torque wrench? Are you following the service manual?

 

 

3 minutes ago, Ben C34 said:

Based on that description it's hard to know what the problem is.

Tdc could be on the exhaust stroke on the compression stroke. Either way bolting down the rockers will be easy on some spots and harder on others due to some valves being open and therefore you are compressing the springs  when tightening the rockers down.

Are you using a torque wrench? Are you following the service manual?

 

 

Correct, with cylinder 1,2,3 rockers are bolting down easy in some spots and not so easy in other spots. Cylinder 4,5,6 no problems!

should I do 1 full rotation on crankshaft and then try to bolt the rockers down? Or can I just put pressure on the bolts compressing the springs down? 
thanks 

You don't have a service manual?

 

It's been nearly 20 yrs since I changed a cam on an rb30.

Service manual foes say to rotate crank.

https://rb30det.com/download/r31-workshop-manual/?wpdmdl=33658&refresh=641d788a8ae221679653002

 

  • Like 1

My guess is the valves are touching the pistons and by forcing it down you’re going to even more damage.

 

Turn the crank to move the pistons down the bore and then tighten down the rockers, put the cam to tdc then move the crank back to tdc 

34 minutes ago, Ben C34 said:

You don't have a service manual?

 

It's been nearly 20 yrs since I changed a cam on an rb30.

Service manual foes say to rotate crank.

https://rb30det.com/download/r31-workshop-manual/?wpdmdl=33658&refresh=641d788a8ae221679653002

 

Thanks buddy, so I would have to rotate it 180* ? would that be from the crankshaft pulley correct?

 

Okay. Bit of a problem. Cranked the car over and my oil is milky 🫣 did compression test and came up good all the cylinders were between 115-120psi. 
not losing much coolant and no bubbling or much pressure rushing out of the radiator.

im thinking maybe the turbo is blown? Can coolant leak into turbo oil drain?

should I do a coolant pressure test and see if coolant is coming out of the turbo oil drain? If yes, I'm assuming turbo needs to be rebuilt. TIA guys!

Edited by VL_Turbo

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now



  • Similar Content

  • Latest Posts

    • Echo the awesome sentiment 👍 Definitely a car worth saving. Looking forward to seeing updates as well. 
    • Scenic roads, stunning skylines, and Chickos to finish it off! Join SAU NSW as we cruise through the Royal National Park and along Lawrence Hargrave Drive to Figtree! Sunday 26th October 2025 4:30PM Meeting Waterfall Station Parking 5:00PM Cruise Departure Royal National Park > Lawrence Hargrave Dr > Memorial Dr > Sid Parrish Park 6:15PM Arrival at Sid Parrish Park Figtree Meet Location: Waterfall Station Parking Final Destination: Sid Parrish Park RSVP: https://forms.gle/E4s5SiRKQfDdypky8 *Disclaimer* There will be a lead and follow car so no one should get lost. If you would like to attend or bring others along please put your name down and a +1 as numbers will be needed prior! This is NOT a race and we will all be adhering to all road rules. If this is what you want please come to one of our many track days. This is an official SAU:NSW event and will be run under a CAMS permit. One of the things that really sets our club apart is our commitment to being true enthusiasts. When on normal roads we strive to maintain good relations with the authorities as well as the public in general. When attending one of Skylines Australia NSW events please try to: • Be aware of surrounding environment and act accordingly. • Drive courteously on the state’s roads as a true enthusiast should. • Understand how important it is to maintain the good name of SAU NSW and thus, treat others accordingly. • Any misbehavior will not be tolerated and you will be asked to leave.
    • It's funny, as Ive seen plenty of people use them in cheap builds on YT. And they actually go okay, even though a lot of other maxspeedingrods stuff is terrible. Those turbos seem reliable enough, the only part being, a good quality turbo that is "identical" to it, will out perform it day in and day out. In both a lower boost threshold, and the ability to flow more air at the same boost pressure. As a cheap cheap replacement, not a terrible choice. For cheap and shouldn't blow in a day, not terrible (like other eBay/Temu turbos) for low cost and still decent performance, that's where the question comes in to play from the results I've seen. I'd actually find it hilarious to buy one, and strap it to a paddock basher or some other cheap as POS originally NA car, and send it to the moon!
    • The maxpeedingrods turbo is cheap and bolts on to stock parts. I think you just need a bigger silicone coupler for the intake. Its a cheap china turbo, but it's been running on mine for almost 3 years at 16-19 psi.
    • What do they look like right after you've tried to start it with everything connected? Also post photos of what they actually look like.
×
×
  • Create New...