As the topic states i am looking for info on this head
Is the block different than other D series?
Will it bolt onto any D series block?
Which intakes will bolt to it?
Aftermarket headers avail for this head?
What tranny's will bolt to the block (if not different ignore question)
What kind of injection does it come with factory? Throttle body or MPFI?

Ok now the explanation i know most of you are just throwing these heads away. I race in an oval racing series up in calgary alberta canada. The CRX HF head was not available in canada. My series strictly dictates 8 valve only. Therefore to I have to run an 83 honda accord motor 1602cc, looking to build something a little newer.
Super79Dave

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Super79Dave &raquo;</TD></TR><TR><TD CLASS="quote">As the topic states i am looking for info on this head
Is the block different than other D series?
Will it bolt onto any D series block?
Which intakes will bolt to it?
Aftermarket headers avail for this head?
What tranny's will bolt to the block (if not different ignore question)
What kind of injection does it come with factory? Throttle body or MPFI?</TD></TR></TABLE>

1) The block is the same but the pistons are different as they only have two valve reliefs each.

2) No intakes will bolt on right on as the throttle body is the size and opening of a golfball.

3) Any D-series header will bolt on to the block

4) You can bolt a L3 Si transmission to it for a boost in acceleration.

5) MPFI Injection stock, but you should try to upgrade the intake manifold to at least the MPFI manifold off the D16A6, and at best the manifold off the D16Y8.

That about sums it up.

 

Thankyou for your answers. In regards to the intake question i meant as in swapping the actually factory intakes as in can i put a D16 on the D15 head?

 

yeah, you can use pretty much any MPFI manifold. i think you will also need to change ECUs to compensate for the extra air

 

If you mean the intake MANIFOLD then yes you can swap it over.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dr_latino999 &raquo;</TD></TR><TR><TD CLASS="quote">If you mean the intake MANIFOLD then yes you can swap it over.</TD></TR></TABLE>

On the other hand, how much would a manifold swap [i]really[/b] help you? Yes, the throttle body, plenum, and runners are all bigger. But you ar going to still have the bottleneck of your 8-valve head. And it is going to be the small ports, along with the abrupt decrease in diameter, that REALLY chokes your engine. Frankly, like any other power mods to an HF motor, this manifold swap really does not seem worth it.

 

If he is doing 8-Valve only and is dead set on the HF platform then every little bit will count before valve train changes. My favorite example of a 8-Valve buildup --&gt;

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by http://www.sdsefi.com/techmods.htm/ &raquo;</TD></TR><TR><TD CLASS="quote">I will use a Toyota 2TC engine which I prepared for road racing use a few years ago as an example of what can be done with properly applied engine modifications and turbocharging. The stock engine starts out as a 1588cc, 2 valve per cylinder, pushrod, crossflow hemi. The stock hp is rated at 70 at 6000 rpm.

The block was bored out from 85mm to 88mm to fit Mahle VW forged pistons. This mod brings the displacement out to 1702cc and drops the compression ratio from 8.6 to 7.2 to 1. The rest of the block is totally stock as is the crankshaft.

The connecting rods were polished and shotpeened. They were converted to a full floating pin arrangement to suit the new pistons and Ford SPS big block bolts were fitted to withstand the higher anticipated rpms.

The camshaft selected was the same cam we used on our race atmo 2T engines with .430 valve lift/ 284/222 degrees duration at 0 and .050 lift respectively on 108 degree lobe centers. Valves were enlarged from 41 to 44.5mm on the intake via Ford 6 cylinder ones and from 36 to 38mm via Nissan 200SX ones. The head was extensively ported on the flow bench taking intake flow from 82 to 122 cfm and the exhaust from 66 to 86 cfm. Valve guides were shortened and bronze bushed for increased flow and heat dissipation. Exhaust seats were widened to .080 for better heat transfer. Norris triple valve springs and aluminum retainers were also used.

A stock oil pump was used and an HKS 1mm metal head gasket was fitted.

On the externals; A custom, equal length header was made using 1.625 inch ID thick walled tubing , a custom intake manifold was made fitted with a 70mm Mercedes throttle body and eight Bosch 490cc injectors. The turbo was a Garrett TO4 with H-3 compressor and a .58 turbine. This blew through a massive Spearco intercooler measuring 17 X 21 X 3 inches and 2.5 inch mandrel bent tubing. The exhaust was 3 inch mandrel bent tubing open. Fuel was M-85.

This engine produced 358hp at 7700 rpm at only 15 psi boost. The stock hp was quintupled! Engine life was approximately 6 hours at this power level and about 15 hours at 12 psi and 310hp. Eventually, the main bearing caps cracked from the power output but this was caught before major damage occurred. The effective powerband was 5000 up. Redline was limited to 7700 rpm mainly for valvetrain longevity although hp was still increasing at this point. This engine was used for road racing so the life expectancy had to be about a full season or 15 hours.</TD></TR></TABLE>

 

I don't have a choice on a bigger head as stated by my rules for my class. However i can change the intake and throttle body to at least alow more air in.
Super79Dave

 

For more air and sticking with OEM parts I would recommendthe D16Y8 manifold (I.E. The Type-R design for SOHCs) and here is a really good write up on how to switch it over - http://www.geocities.com/joeyp....html

 

this is an interesting thread

excuse the noob question but:

couldnt he get the head port matched to the si/ex manifold, or is that impossible?

does your class allow milling/porting of the head?

 

If the ports are smaller on the HF head then yes they can be matched.

 

Yes i can gasket match intake to head up to one inch 1/2 into the intake 1/2 into the head.

At this point my thoughts are to put the american head on a canadian 1.6 with the mpfi intake and throttle body. I've found a donor car with all the pieces i'll need. However i just need an american 8 valve head anyone got one for sale please pretty please.

The donor car i'm going to buy has the PFI throttle body style. which could be advantages i can put a carb on that manifold with an adapter plate. The rules for class dictate higher weight for injection and if i put the 8 valve head on a 1.6 block the weight goes up. 1.1lb for injection 1.05 lb for carb.

The lightest i've ever had the car is 1657lbs. so i'm putting it on a diet as well.

Anyway if anyone has an 8 valve head i'd really like to aquire one so i can get the project started.
Super79Dave

 

Don't forget, if you are using an 8-valve head on a block that naturally supported 16-valves, check to make sure that the pistons have adequate reliefs.

 

We'll i've already accounted for that. However i kind of need to get all the components together so i can start deciding how to go about that. wether i order the 8 valve piston or just enlarge the reliefs in the pistons.
Super79Dave

 

Bump i need a HF 8 valve head and camshaft
Super79Dave

 

I can possibly pull a head out of a local salvage yard, but with their cost + shipping to the frigid north you are looking at a costly expenditure. Just ask around here as someone has to have a one they are getting ready to throw away.

 

i have a 89 crx hf and i just did a b16 swap i have complete motor and tranny minus the wiring harness for sale hit me up

 

I'd love just the head, and camshaft if you could let me know how you much and how you want to ship it etc.. I just need the head and the camshaft.
Super79Dave

 

i dont want to seperate the head and block so ill let you have both for $100. Also i have an Si head and i think the cam will perform alot better than the hf. let me know if you are interested.

 

I don't think the cam's are interchangeable due to the valve train differences, but I could be wrong.