up the power on the 18r

[o_man_ra23]

Hosking, a thorough compression test will tell you if it is a valve or not. Put a drop or 2 of oil down the chamber, and re-do your compression test. If the compression does not improve dramatically, you have a bung valve or faulty head gasket. If the compression does improve, you have a bottom end issue (machinist may have ground too much out of that bore??)

Mitch, I do believe the pin height is different, but you can get longer rods to compensate (16R I think)

[hosking1991]

well what i have done so far

weber 32/36 carb with xf falcon electric choke
extractors
going in for an exhaust system on monday

18r is running really sweet revs very happily to 6 grand
acceleration is pretty good. compression is 155 on all cylinders and motor has only just hit 1000 kays since rebuild

will be going to get my spare cam ground to stage 2

so overall i really happy with how mine turned out the carby sounds awesome when the secondaries are open

[Spectre]

Hey guys having problems with the accelerator link picked up one from an ra28 but 18r is from a corona it seems the cable is pulling the wrong way or is it the corona carby thats goin the wrong way for the links? Any suggestions??

[o_man_ra23]

Grab an RA28 carby?? I may have one available soon in good condition. Otherwise, looking forward along the car, the linkage should join at the rear, and it should rotate counter clockwise to open the throttle.

[hosking1991]

Would you see much improvement in 'back cutting' the stock 18r valves. the tradesman at work said on a his 351 windsor there was a 25% increase in flow with stock valves by just backcutting them

[river]

Hi,

For an 18R-C, 25% increase of fuck all is still fuck all.

Not worth the cost.

seeyuzz
river

[hosking1991]

Not worth the cost.

i work in a engine reco shop i can do all the work for free

[o_man_ra23]

I can't see a 25% increase by doing a back cut, unless your seats are fooked to start with, in which case a normal re-seat would gain most of that. There are 3 major restrictions in the 18R - Cam, Carb and Valve size. Fix these, clean up the ports, and open up the exhaust, and you will be 3/4 of the way there. If you can get more compression, that will only help once the first 3 restrictions have been dealt with.

[morriscnty]

I know this is a very old thread on the 18R engine,but I am looking for information regarding my 18R-E engine,I am struggling to find any details on the performance ' if any' compression ratio if it has hardened valve seats so I can run on unleaded etc thanks Bob

[o_man_ra23]

G'day Bob, check out the 18RG tractor engine thread. There are some really knowledgeable people who haunt that who would be able to give you the info you are after.

[morriscnty]

Thanks for the info Owen,I will have a good browse

[river]

Hi,

The 18R-E should have hardened valve seats to take ULP. I know all the 18R-G twin-cam engines had hardened valves seats. I think the single cam 18R engines had hardened valve seats (18R and 18R-U), but there is little info on the 18R-E. The Japs were running ULP in the early 70s, which required hardened valve seats, so you should be okay.

The 18R-E is the fuel injected version of the SOHC 18R. Power of the 18R-E engine seems to vary according to where you read it. Toyota say its about 130hp, but other sites state it at 113hp.

I might have some info on the 18R-E, but not sure how much (or how little). Will see what I got at home over the weekend, but if anything it may be a scan from an old brochure and stuff like that, as opposed to full engineering/maintenance/workshop manual sort of information.

seeyuzz
river

[morriscnty]

I am hoping I can run on unleaded but I have been using LRP additives to be on the safe side,I have been told all U.K. 18R's need lead so additves are a must.I belive the U.S version using the 18RC engine could run on unleaded.... I could be O.K. to run without if the japs were using unleaded from the 70s.I did see somewhere that 18RE had a higher compression rating but I have lost the info regarding this, so this could have an affect on octane rating...I tend to use the top spec ....I think it runs better than on the supermarket stuff! thanks for the info cheers Bob

[liteace]

Yes I know its a big stab in the dark BUT some peeps still play with these engines like me
and does anyone have a turbo manifold to suit the 18R?

8.5 to 1 compression ratio just sounds right for boost and nothing much else,however a well built engines with the mentioned NA mods makes a nice smooth reliable daily rather than monster.
Chain tensioner mods are a must and even stretched chains can be tightened further with mods but overall its really a bullet proof motor that would respond well to boost if kept below 6500 rpm.

heres the old lost link to the 18r engines from waybackmachine.org

http://web.archive.org/web/200903051...pho/eng18r.htm

[o_man_ra23]

Steven Horne put a complete set up for sale on the Toymods Facebook page for $1000... with the intake and turbo!